51605617516 has 12 divisors (see below), whose sum is σ = 90314985040. Its totient is φ = 25801336080.

The previous prime is 51605617507. The next prime is 51605617579. The reversal of 51605617516 is 61571650615.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287355 + ... + 431026.

Almost surely, 2^51605617516 is an apocalyptic number.

It is an amenable number.

51605617516 is a deficient number, since it is larger than the sum of its proper divisors (38709367524).

51605617516 is a wasteful number, since it uses less digits than its factorization.

51605617516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736344 (or 736342 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 51605617516 in words is "fifty-one billion, six hundred five million, six hundred seventeen thousand, five hundred sixteen".