65961515904 has 32 divisors (see below), whose sum is σ = 175210277640. Its totient is φ = 21987171840.

The previous prime is 65961515891. The next prime is 65961515929. The reversal of 65961515904 is 40951516956.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

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, 85887007 + ... + 85887774.

Almost surely, 2^65961515904 is an apocalyptic number.

65961515904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

65961515904 is an abundant number, since it is smaller than the sum of its proper divisors (109248761736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65961515904 is a wasteful number, since it uses less digits than its factorization.

65961515904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171774798 (or 171774786 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 51.

The spelling of 65961515904 in words is "sixty-five billion, nine hundred sixty-one million, five hundred fifteen thousand, nine hundred four".