51656561510615 has 16 divisors (see below), whose sum is σ = 62073598537728. Its totient is φ = 41268123182496.

The previous prime is 51656561510509. The next prime is 51656561510651. The reversal of 51656561510615 is 51601516565615.

It is a cyclic number.

It is not a de Polignac number, because 51656561510615 - 2²⁶ = 51656494401751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15913994 + ... + 18883016.

It is an arithmetic number, because the mean of its divisors is an integer number (3879599908608).

Almost surely, 2^{51656561510615} is an apocalyptic number.

51656561510615 is a deficient number, since it is larger than the sum of its proper divisors (10417037027113).

51656561510615 is a wasteful number, since it uses less digits than its factorization.

51656561510615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2973838.

The product of its (nonzero) digits is 4050000, while the sum is 53.

The spelling of 51656561510615 in words is "fifty-one trillion, six hundred fifty-six billion, five hundred sixty-one million, five hundred ten thousand, six hundred fifteen".