664604650 has 12 divisors (see below), whose sum is σ = 1236164742. Its totient is φ = 265841840.

The previous prime is 664604623. The next prime is 664604651. The reversal of 664604650 is 56406466.

It can be written as a sum of positive squares in 3 ways, for example, as 511166881 + 153437769 = 22609^2 + 12387^2 .

It is not an unprimeable number, because it can be changed into a prime (664604651) 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, 6645997 + ... + 6646096.

Almost surely, 2^664604650 is an apocalyptic number.

664604650 is a deficient number, since it is larger than the sum of its proper divisors (571560092).

664604650 is a wasteful number, since it uses less digits than its factorization.

664604650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13292105 (or 13292100 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 664604650 is about 25779.9272690983. The cubic root of 664604650 is about 872.6788658014.

The spelling of 664604650 in words is "six hundred sixty-four million, six hundred four thousand, six hundred fifty".