664959574 has 16 divisors (see below), whose sum is σ = 1008229680. Its totient is φ = 328894720.

The previous prime is 664959557. The next prime is 664959577. The reversal of 664959574 is 475959466.

It is a happy number.

It is a super-2 number, since 2×664959574² = 884342470108522952, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664959577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126009 + ... + 131179.

It is an arithmetic number, because the mean of its divisors is an integer number (63014355).

Almost surely, 2^664959574 is an apocalyptic number.

664959574 is a deficient number, since it is larger than the sum of its proper divisors (343270106).

664959574 is a wasteful number, since it uses less digits than its factorization.

664959574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5855.

The product of its digits is 8164800, while the sum is 55.

The square root of 664959574 is about 25786.8100780224. The cubic root of 664959574 is about 872.8341859873.

The spelling of 664959574 in words is "six hundred sixty-four million, nine hundred fifty-nine thousand, five hundred seventy-four".