664100626 has 12 divisors (see below), whose sum is σ = 1158787998. Its totient is φ = 284614512.

The previous prime is 664100621. The next prime is 664100629. The reversal of 664100626 is 626001466.

It can be written as a sum of positive squares in only one way, i.e., 615784225 + 48316401 = 24815^2 + 6951^2 .

It is not an unprimeable number, because it can be changed into a prime (664100621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3388171 + ... + 3388366.

Almost surely, 2^664100626 is an apocalyptic number.

664100626 is a deficient number, since it is larger than the sum of its proper divisors (494687372).

664100626 is a wasteful number, since it uses less digits than its factorization.

664100626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6776553 (or 6776546 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 664100626 is about 25770.1499025520. The cubic root of 664100626 is about 872.4582021175.

The spelling of 664100626 in words is "six hundred sixty-four million, one hundred thousand, six hundred twenty-six".