664737882520 has 32 divisors (see below), whose sum is σ = 1496329038000. Its totient is φ = 265776254848.

The previous prime is 664737882451. The next prime is 664737882569. The reversal of 664737882520 is 25288737466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3624970 + ... + 3803929.

Almost surely, 2^664737882520 is an apocalyptic number.

It is an amenable number.

664737882520 is an abundant number, since it is smaller than the sum of its proper divisors (831591155480).

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

664737882520 is a wasteful number, since it uses less digits than its factorization.

664737882520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7431147 (or 7431143 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 58.

The spelling of 664737882520 in words is "six hundred sixty-four billion, seven hundred thirty-seven million, eight hundred eighty-two thousand, five hundred twenty".