664710516 has 48 divisors (see below), whose sum is σ = 1814030400. Its totient is φ = 209907936.

The previous prime is 664710509. The next prime is 664710517. The reversal of 664710516 is 615017466.

664710516 is a `hidden beast` number, since 6 + 647 + 1 + 0 + 5 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664710517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159915 + ... + 164018.

It is an arithmetic number, because the mean of its divisors is an integer number (37792300).

Almost surely, 2^664710516 is an apocalyptic number.

It is an amenable number.

664710516 is an abundant number, since it is smaller than the sum of its proper divisors (1149319884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664710516 is a wasteful number, since it uses less digits than its factorization.

664710516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323965 (or 323957 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 664710516 is about 25781.9804514704. The cubic root of 664710516 is about 872.7252001726.

The spelling of 664710516 in words is "six hundred sixty-four million, seven hundred ten thousand, five hundred sixteen".