664012516 has 6 divisors (see below), whose sum is σ = 1162021910. Its totient is φ = 332006256.

The previous prime is 664012499. The next prime is 664012549. The reversal of 664012516 is 615210466.

It can be written as a sum of positive squares in only one way, i.e., 625000000 + 39012516 = 25000^2 + 6246^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83001561 + ... + 83001568.

Almost surely, 2^664012516 is an apocalyptic number.

It is an amenable number.

664012516 is a deficient number, since it is larger than the sum of its proper divisors (498009394).

664012516 is a wasteful number, since it uses less digits than its factorization.

664012516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166003133 (or 166003131 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 664012516 is about 25768.4403098053. The cubic root of 664012516 is about 872.4196157502.

The spelling of 664012516 in words is "six hundred sixty-four million, twelve thousand, five hundred sixteen".