64538168644704 has 24 divisors (see below), whose sum is σ = 169412692692600. Its totient is φ = 21512722881536.

The previous prime is 64538168644681. The next prime is 64538168644711. The reversal of 64538168644704 is 40744686183546.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

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, 336136294929 + ... + 336136295120.

It is an arithmetic number, because the mean of its divisors is an integer number (7058862195525).

Almost surely, 2^{64538168644704} is an apocalyptic number.

It is an amenable number.

64538168644704 is an abundant number, since it is smaller than the sum of its proper divisors (104874524047896).

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

64538168644704 is a wasteful number, since it uses less digits than its factorization.

64538168644704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672272590062 (or 672272590054 counting only the distinct ones).

The product of its (nonzero) digits is 371589120, while the sum is 66.

The spelling of 64538168644704 in words is "sixty-four trillion, five hundred thirty-eight billion, one hundred sixty-eight million, six hundred forty-four thousand, seven hundred four".