56666717015 has 16 divisors (see below), whose sum is σ = 75130504128. Its totient is φ = 40811629056.

The previous prime is 56666716987. The next prime is 56666717017. The reversal of 56666717015 is 51071766665.

It is a cyclic number.

It is not a de Polignac number, because 56666717015 - 2⁸ = 56666716759 is a prime.

It is a super-2 number, since 2×56666717015² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56666717017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14490812 + ... + 14494721.

It is an arithmetic number, because the mean of its divisors is an integer number (4695656508).

Almost surely, 2^56666717015 is an apocalyptic number.

56666717015 is a deficient number, since it is larger than the sum of its proper divisors (18463787113).

56666717015 is a wasteful number, since it uses less digits than its factorization.

56666717015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28985578.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 56666717015 in words is "fifty-six billion, six hundred sixty-six million, seven hundred seventeen thousand, fifteen".