664506369888 has 48 divisors (see below), whose sum is σ = 1744604789760. Its totient is φ = 221467130496.

The previous prime is 664506369859. The next prime is 664506369899. The reversal of 664506369888 is 888963605466.

664506369888 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

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, 67653 + ... + 1154811.

It is an arithmetic number, because the mean of its divisors is an integer number (36345933120).

Almost surely, 2^664506369888 is an apocalyptic number.

It is an amenable number.

664506369888 is an abundant number, since it is smaller than the sum of its proper divisors (1080098419872).

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

664506369888 is a wasteful number, since it uses less digits than its factorization.

664506369888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093539 (or 1093531 counting only the distinct ones).

The product of its (nonzero) digits is 358318080, while the sum is 69.

The spelling of 664506369888 in words is "six hundred sixty-four billion, five hundred six million, three hundred sixty-nine thousand, eight hundred eighty-eight".