64660156511568 has 40 divisors (see below), whose sum is σ = 167039243253600. Its totient is φ = 21553320265344.

The previous prime is 64660156511551. The next prime is 64660156511609. The reversal of 64660156511568 is 86511565106646.

It is a happy number.

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, 15548803 + ... + 19263581.

It is an arithmetic number, because the mean of its divisors is an integer number (4175981081340).

Almost surely, 2^{64660156511568} is an apocalyptic number.

It is an amenable number.

64660156511568 is an abundant number, since it is smaller than the sum of its proper divisors (102379086742032).

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

64660156511568 is a wasteful number, since it uses less digits than its factorization.

64660156511568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4077419 (or 4077413 counting only the distinct ones).

The product of its (nonzero) digits is 31104000, while the sum is 60.

The spelling of 64660156511568 in words is "sixty-four trillion, six hundred sixty billion, one hundred fifty-six million, five hundred eleven thousand, five hundred sixty-eight".