> Should you use RSA in production always make sure to use numbers which are at least 512 Bit / 64 Byte long.

512-bit RSA has been breakable, by academics, since before this millennium.

> RSA number | Decimal digits | Binary digits | Cash prize offered | Factored on | Factored by

> RSA155 | 155 | 512 | US$9,383[8] | August 22, 1999 | Herman te Riele et al.

https://en.wikipedia.org/wiki/RSA_Factoring_Challenge

Further, according to authors of the paper factoring RSA-768 (bit), in 2009/10

> it would be prudent to phase out usage of 1024-bit RSA within the next three to four years. (p1, 2010)

https://eprint.iacr.org/2010/006.pdf