664632495720 has 256 divisors, whose sum is σ = 2347706592000. Its totient is φ = 166671433728.

The previous prime is 664632495719. The next prime is 664632495733. The reversal of 664632495720 is 27594236466.

664632495720 is a `hidden beast` number, since 6 + 6 + 4 + 63 + 2 + 4 + 9 + 572 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23100864 + ... + 23129616.

It is an arithmetic number, because the mean of its divisors is an integer number (9170728875).

Almost surely, 2^664632495720 is an apocalyptic number.

664632495720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664632495720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173853296000).

664632495720 is an abundant number, since it is smaller than the sum of its proper divisors (1683074096280).

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

664632495720 is a wasteful number, since it uses less digits than its factorization.

664632495720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30049 (or 30039 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 54.

The spelling of 664632495720 in words is "six hundred sixty-four billion, six hundred thirty-two million, four hundred ninety-five thousand, seven hundred twenty".