56726306661 has 16 divisors (see below), whose sum is σ = 76168963584. Its totient is φ = 37551076464.

The previous prime is 56726306627. The next prime is 56726306731. The reversal of 56726306661 is 16660362765.

It is not a de Polignac number, because 56726306661 - 2¹⁸ = 56726044517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56726306661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56726305661) 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, 414666 + ... + 534228.

It is an arithmetic number, because the mean of its divisors is an integer number (4760560224).

Almost surely, 2^56726306661 is an apocalyptic number.

It is an amenable number.

56726306661 is a deficient number, since it is larger than the sum of its proper divisors (19442656923).

56726306661 is a wasteful number, since it uses less digits than its factorization.

56726306661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120680.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 56726306661 in words is "fifty-six billion, seven hundred twenty-six million, three hundred six thousand, six hundred sixty-one".