56715666 has 16 divisors (see below), whose sum is σ = 129635904. Its totient is φ = 16204464.

The previous prime is 56715661. The next prime is 56715679. The reversal of 56715666 is 66651765.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1350373 = 56715666 / (5 + 6 + 7 + 1 + 5 + 6 + 6 + 6).

It is not an unprimeable number, because it can be changed into a prime (56715661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675145 + ... + 675228.

It is an arithmetic number, because the mean of its divisors is an integer number (8102244).

Almost surely, 2^56715666 is an apocalyptic number.

56715666 is an abundant number, since it is smaller than the sum of its proper divisors (72920238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56715666 is a wasteful number, since it uses less digits than its factorization.

56715666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350385.

The product of its digits is 226800, while the sum is 42.

The square root of 56715666 is about 7530.9804142621. The cubic root of 56715666 is about 384.2091281662.

The spelling of 56715666 in words is "fifty-six million, seven hundred fifteen thousand, six hundred sixty-six".