664517066 has 16 divisors (see below), whose sum is σ = 1015395264. Its totient is φ = 326109504.

The previous prime is 664517057. The next prime is 664517071. The reversal of 664517066 is 660715466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9005 + ... + 37551.

It is an arithmetic number, because the mean of its divisors is an integer number (63462204).

Almost surely, 2^664517066 is an apocalyptic number.

664517066 is a deficient number, since it is larger than the sum of its proper divisors (350878198).

664517066 is a wasteful number, since it uses less digits than its factorization.

664517066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28765.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 664517066 is about 25778.2285271894. The cubic root of 664517066 is about 872.6405291935.

The spelling of 664517066 in words is "six hundred sixty-four million, five hundred seventeen thousand, sixty-six".