664455590 has 16 divisors (see below), whose sum is σ = 1197244800. Its totient is φ = 265510080.

The previous prime is 664455551. The next prime is 664455601. The reversal of 664455590 is 95554466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23615 + ... + 43434.

It is an arithmetic number, because the mean of its divisors is an integer number (74827800).

Almost surely, 2^664455590 is an apocalyptic number.

664455590 is a deficient number, since it is larger than the sum of its proper divisors (532789210).

664455590 is a wasteful number, since it uses less digits than its factorization.

664455590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68047.

The product of its (nonzero) digits is 648000, while the sum is 44.

The square root of 664455590 is about 25777.0360980466. The cubic root of 664455590 is about 872.6136183705.

The spelling of 664455590 in words is "six hundred sixty-four million, four hundred fifty-five thousand, five hundred ninety".