665060644 has 24 divisors (see below), whose sum is σ = 1200140928. Its totient is φ = 322236000.

The previous prime is 665060623. The next prime is 665060699. The reversal of 665060644 is 446060566.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28197 + ... + 46099.

It is an arithmetic number, because the mean of its divisors is an integer number (50005872).

Almost surely, 2^665060644 is an apocalyptic number.

It is an amenable number.

665060644 is a deficient number, since it is larger than the sum of its proper divisors (535080284).

665060644 is a wasteful number, since it uses less digits than its factorization.

665060644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18195 (or 18193 counting only the distinct ones).

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

The square root of 665060644 is about 25788.7697263751. The cubic root of 665060644 is about 872.8784056590.

The spelling of 665060644 in words is "six hundred sixty-five million, sixty thousand, six hundred forty-four".