56661715 has 8 divisors (see below), whose sum is σ = 74175408. Its totient is φ = 41208480.

The previous prime is 56661691. The next prime is 56661727. The reversal of 56661715 is 51716665.

56661715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56661715 - 2⁷ = 56661587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 515052 + ... + 515161.

It is an arithmetic number, because the mean of its divisors is an integer number (9271926).

Almost surely, 2^56661715 is an apocalyptic number.

56661715 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

56661715 is a deficient number, since it is larger than the sum of its proper divisors (17513693).

56661715 is a wasteful number, since it uses less digits than its factorization.

56661715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030229.

The product of its digits is 37800, while the sum is 37.

The square root of 56661715 is about 7527.3976246775. The cubic root of 56661715 is about 384.0872627023.

It can be divided in two parts, 5666 and 1715, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 56661715 in words is "fifty-six million, six hundred sixty-one thousand, seven hundred fifteen".