56665015 has 16 divisors (see below), whose sum is σ = 74681856. Its totient is φ = 40932000.

The previous prime is 56664997. The next prime is 56665027. The reversal of 56665015 is 51056665.

It is not a de Polignac number, because 56665015 - 2⁵ = 56664983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4894 + ... + 11716.

It is an arithmetic number, because the mean of its divisors is an integer number (4667616).

Almost surely, 2^56665015 is an apocalyptic number.

56665015 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

56665015 is a deficient number, since it is larger than the sum of its proper divisors (18016841).

56665015 is a wasteful number, since it uses less digits than its factorization.

56665015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6990.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 56665015 is about 7527.6168207475. The cubic root of 56665015 is about 384.0947190207.

It can be divided in two parts, 566650 and 15, that added together give a palindrome (566665).

The spelling of 56665015 in words is "fifty-six million, six hundred sixty-five thousand, fifteen".