664591152 has 20 divisors (see below), whose sum is σ = 1716860600. Its totient is φ = 221530368.

The previous prime is 664591129. The next prime is 664591159. The reversal of 664591152 is 251195466.

It is a self number, because there is not a number n which added to its sum of digits gives 664591152.

It is not an unprimeable number, because it can be changed into a prime (664591159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6922777 + ... + 6922872.

It is an arithmetic number, because the mean of its divisors is an integer number (85843030).

Almost surely, 2^664591152 is an apocalyptic number.

It is an amenable number.

664591152 is an abundant number, since it is smaller than the sum of its proper divisors (1052269448).

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

664591152 is a wasteful number, since it uses less digits than its factorization.

664591152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13845660 (or 13845654 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 664591152 is about 25779.6654749436. The cubic root of 664591152 is about 872.6729577782.

The spelling of 664591152 in words is "six hundred sixty-four million, five hundred ninety-one thousand, one hundred fifty-two".