56666666665 has 12 divisors (see below), whose sum is σ = 79102041156. Its totient is φ = 38857142688.

The previous prime is 56666666657. The next prime is 56666666669.

56666666665 is nontrivially palindromic in base 10.

56666666665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 10460584729 + 46206081936 = 102277^2 + 214956^2 .

It is not a de Polignac number, because 56666666665 - 2³ = 56666666657 is a prime.

It is a super-2 number, since 2×56666666665² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56666666597 and 56666666606.

It is not an unprimeable number, because it can be changed into a prime (56666666669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115646014 + ... + 115646503.

It is an arithmetic number, because the mean of its divisors is an integer number (6591836763).

Almost surely, 2^56666666665 is an apocalyptic number.

It is an amenable number.

56666666665 is a deficient number, since it is larger than the sum of its proper divisors (22435374491).

56666666665 is a wasteful number, since it uses less digits than its factorization.

56666666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231292536 (or 231292529 counting only the distinct ones).

The product of its digits is 251942400, while the sum is 64.

The spelling of 56666666665 in words is "fifty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-five".