65679988997656 has 32 divisors (see below), whose sum is σ = 142248104516880. Its totient is φ = 28098391014400.

The previous prime is 65679988997633. The next prime is 65679988997729.

65679988997656 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21951866485 + ... + 21951869476.

Almost surely, 2^{65679988997656} is an apocalyptic number.

It is an amenable number.

65679988997656 is an abundant number, since it is smaller than the sum of its proper divisors (76568115519224).

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

65679988997656 is a wasteful number, since it uses less digits than its factorization.

65679988997656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43903735995 (or 43903735991 counting only the distinct ones).

The product of its digits is 666639590400, while the sum is 100.

The spelling of 65679988997656 in words is "sixty-five trillion, six hundred seventy-nine billion, nine hundred eighty-eight million, nine hundred ninety-seven thousand, six hundred fifty-six".