66560810 has 16 divisors (see below), whose sum is σ = 120223656. Its totient is φ = 26532288.

The previous prime is 66560803. The next prime is 66560843. The reversal of 66560810 is 1806566.

It can be written as a sum of positive squares in 4 ways, for example, as 61795321 + 4765489 = 7861^2 + 2183^2 .

It is a super-2 number, since 2×66560810² = 8860682855712200, which contains 22 as substring.

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, 8429 + ... + 14288.

Almost surely, 2^66560810 is an apocalyptic number.

66560810 is a deficient number, since it is larger than the sum of its proper divisors (53662846).

66560810 is a wasteful number, since it uses less digits than its factorization.

66560810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23017.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 66560810 is about 8158.4808634941. The cubic root of 66560810 is about 405.2654054700.

The spelling of 66560810 in words is "sixty-six million, five hundred sixty thousand, eight hundred ten".