660557264 has 20 divisors (see below), whose sum is σ = 1280262180. Its totient is φ = 330167040.

The previous prime is 660557257. The next prime is 660557291. The reversal of 660557264 is 462755066.

It can be written as a sum of positive squares in 2 ways, for example, as 532686400 + 127870864 = 23080^2 + 11308^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63332 + ... + 73020.

It is an arithmetic number, because the mean of its divisors is an integer number (64013109).

Almost surely, 2^660557264 is an apocalyptic number.

It is an amenable number.

660557264 is a deficient number, since it is larger than the sum of its proper divisors (619704916).

660557264 is a wasteful number, since it uses less digits than its factorization.

660557264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13958 (or 13952 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 660557264 is about 25701.3086048162. The cubic root of 660557264 is about 870.9037440155.

The spelling of 660557264 in words is "six hundred sixty million, five hundred fifty-seven thousand, two hundred sixty-four".