56701551621 has 64 divisors (see below), whose sum is σ = 89633666304. Its totient is φ = 31431628800.

The previous prime is 56701551587. The next prime is 56701551637. The reversal of 56701551621 is 12615510765.

It is a happy number.

It is not a de Polignac number, because 56701551621 - 2¹⁷ = 56701420549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 56701551621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56701551421) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24302971 + ... + 24305303.

It is an arithmetic number, because the mean of its divisors is an integer number (1400526036).

Almost surely, 2^56701551621 is an apocalyptic number.

It is an amenable number.

56701551621 is a deficient number, since it is larger than the sum of its proper divisors (32932114683).

56701551621 is a wasteful number, since it uses less digits than its factorization.

56701551621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 56701551621 in words is "fifty-six billion, seven hundred one million, five hundred fifty-one thousand, six hundred twenty-one".