664774032120 has 128 divisors (see below), whose sum is σ = 2184293018880. Its totient is φ = 160515200000.

The previous prime is 664774032071. The next prime is 664774032149. The reversal of 664774032120 is 21230477466.

It is a congruent number.

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, 671901 + ... + 1334540.

It is an arithmetic number, because the mean of its divisors is an integer number (17064789210).

Almost surely, 2^664774032120 is an apocalyptic number.

664774032120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664774032120 is an abundant number, since it is smaller than the sum of its proper divisors (1519518986760).

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

664774032120 is a wasteful number, since it uses less digits than its factorization.

664774032120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006717 (or 2006713 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 42.

The spelling of 664774032120 in words is "six hundred sixty-four billion, seven hundred seventy-four million, thirty-two thousand, one hundred twenty".