665564516 has 12 divisors (see below), whose sum is σ = 1164923760. Its totient is φ = 332729160.

The previous prime is 665564507. The next prime is 665564527. The reversal of 665564516 is 615465566.

It is a happy number.

It is a super-2 number, since 2×665564516² = 885952249916628512, which contains 22 as substring.

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, 32351 + ... + 48761.

It is an arithmetic number, because the mean of its divisors is an integer number (97076980).

Almost surely, 2^665564516 is an apocalyptic number.

It is an amenable number.

665564516 is a deficient number, since it is larger than the sum of its proper divisors (499359244).

665564516 is a wasteful number, since it uses less digits than its factorization.

665564516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26554 (or 26552 counting only the distinct ones).

The product of its digits is 648000, while the sum is 44.

The square root of 665564516 is about 25798.5370903080. The cubic root of 665564516 is about 873.0987905541.

The spelling of 665564516 in words is "six hundred sixty-five million, five hundred sixty-four thousand, five hundred sixteen".