664255500 has 48 divisors (see below), whose sum is σ = 1934316384. Its totient is φ = 177134400.

The previous prime is 664255477. The next prime is 664255511. The reversal of 664255500 is 5552466.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219919 + ... + 222918.

It is an arithmetic number, because the mean of its divisors is an integer number (40298258).

Almost surely, 2^664255500 is an apocalyptic number.

664255500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664255500 is an abundant number, since it is smaller than the sum of its proper divisors (1270060884).

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

664255500 is a wasteful number, since it uses less digits than its factorization.

664255500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442859 (or 442847 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 664255500 is about 25773.1546381113. The cubic root of 664255500 is about 872.5260184412.

The spelling of 664255500 in words is "six hundred sixty-four million, two hundred fifty-five thousand, five hundred".