664255264443056 has 160 divisors (see below), whose sum is σ = 1514957919154176. Its totient is φ = 278162377344000.

The previous prime is 664255264443031. The next prime is 664255264443061. The reversal of 664255264443056 is 650344462552466.

It is a self number, because there is not a number n which added to its sum of digits gives 664255264443056.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4542744026 + ... + 4542890246.

Almost surely, 2^{664255264443056} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664255264443056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (757478959577088).

664255264443056 is an abundant number, since it is smaller than the sum of its proper divisors (850702654711120).

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

664255264443056 is a wasteful number, since it uses less digits than its factorization.

664255264443056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150131 (or 150125 counting only the distinct ones).

The product of its (nonzero) digits is 497664000, while the sum is 62.

The spelling of 664255264443056 in words is "six hundred sixty-four trillion, two hundred fifty-five billion, two hundred sixty-four million, four hundred forty-three thousand, fifty-six".