664373400471544 has 32 divisors (see below), whose sum is σ = 1347039935887680. Its totient is φ = 305994257035264.

The previous prime is 664373400471511. The next prime is 664373400471563. The reversal of 664373400471544 is 445174004373466.

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, 51969126937 + ... + 51969139720.

It is an arithmetic number, because the mean of its divisors is an integer number (42094997996490).

Almost surely, 2^{664373400471544} is an apocalyptic number.

It is an amenable number.

664373400471544 is an abundant number, since it is smaller than the sum of its proper divisors (682666535416136).

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

664373400471544 is a wasteful number, since it uses less digits than its factorization.

664373400471544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103938266727 (or 103938266723 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 58.

The spelling of 664373400471544 in words is "six hundred sixty-four trillion, three hundred seventy-three billion, four hundred million, four hundred seventy-one thousand, five hundred forty-four".