51510616656165 has 80 divisors (see below), whose sum is σ = 95362958465280. Its totient is φ = 26580503445120.

The previous prime is 51510616656151. The next prime is 51510616656209. The reversal of 51510616656165 is 56165661601515.

51510616656165 is a `hidden beast` number, since 5 + 1 + 5 + 1 + 0 + 6 + 16 + 6 + 5 + 616 + 5 = 666.

It is not a de Polignac number, because 51510616656165 - 2⁵ = 51510616656133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6919581 + ... + 12284210.

It is an arithmetic number, because the mean of its divisors is an integer number (1192036980816).

Almost surely, 2^{51510616656165} is an apocalyptic number.

It is an amenable number.

51510616656165 is a deficient number, since it is larger than the sum of its proper divisors (43852341809115).

51510616656165 is a wasteful number, since it uses less digits than its factorization.

51510616656165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19204024 (or 19204015 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 54.

The spelling of 51510616656165 in words is "fifty-one trillion, five hundred ten billion, six hundred sixteen million, six hundred fifty-six thousand, one hundred sixty-five".