666625604 has 6 divisors (see below), whose sum is σ = 1166594814. Its totient is φ = 333312800.

The previous prime is 666625549. The next prime is 666625627. The reversal of 666625604 is 406526666.

It can be written as a sum of positive squares in only one way, i.e., 590587204 + 76038400 = 24302^2 + 8720^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83328197 + ... + 83328204.

It is an arithmetic number, because the mean of its divisors is an integer number (194432469).

Almost surely, 2^666625604 is an apocalyptic number.

It is an amenable number.

666625604 is a deficient number, since it is larger than the sum of its proper divisors (499969210).

666625604 is a wasteful number, since it uses less digits than its factorization.

666625604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166656405 (or 166656403 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 666625604 is about 25819.0937873505. The cubic root of 666625604 is about 873.5625285963.

The spelling of 666625604 in words is "six hundred sixty-six million, six hundred twenty-five thousand, six hundred four".