51516364665 has 16 divisors (see below), whose sum is σ = 85085093376. Its totient is φ = 26589091200.

The previous prime is 51516364651. The next prime is 51516364703. The reversal of 51516364665 is 56646361515.

It is not a de Polignac number, because 51516364665 - 2¹⁹ = 51515840377 is a prime.

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, 55393476 + ... + 55394405.

It is an arithmetic number, because the mean of its divisors is an integer number (5317818336).

Almost surely, 2^51516364665 is an apocalyptic number.

It is an amenable number.

51516364665 is a deficient number, since it is larger than the sum of its proper divisors (33568728711).

51516364665 is a wasteful number, since it uses less digits than its factorization.

51516364665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110787920.

The product of its digits is 1944000, while the sum is 48.

The spelling of 51516364665 in words is "fifty-one billion, five hundred sixteen million, three hundred sixty-four thousand, six hundred sixty-five".