72656806985 has 16 divisors (see below), whose sum is σ = 101130842496. Its totient is φ = 49078199808.

The previous prime is 72656806883. The next prime is 72656807033. The reversal of 72656806985 is 58960865627.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72656806985 is a prime.

It is a Duffinian number.

It is a Curzon 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, 15489512 + ... + 15494201.

It is an arithmetic number, because the mean of its divisors is an integer number (6320677656).

Almost surely, 2^72656806985 is an apocalyptic number.

It is an amenable number.

72656806985 is a deficient number, since it is larger than the sum of its proper divisors (28474035511).

72656806985 is a wasteful number, since it uses less digits than its factorization.

72656806985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30983792.

The product of its (nonzero) digits is 43545600, while the sum is 62.

The spelling of 72656806985 in words is "seventy-two billion, six hundred fifty-six million, eight hundred six thousand, nine hundred eighty-five".