56736716221 has 4 divisors (see below), whose sum is σ = 59722859200. Its totient is φ = 53750573244.

The previous prime is 56736716213. The next prime is 56736716251. The reversal of 56736716221 is 12261763765.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56736716221 - 2³ = 56736716213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56736716251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1493071461 + ... + 1493071498.

It is an arithmetic number, because the mean of its divisors is an integer number (14930714800).

Almost surely, 2^56736716221 is an apocalyptic number.

It is an amenable number.

56736716221 is a deficient number, since it is larger than the sum of its proper divisors (2986142979).

56736716221 is a wasteful number, since it uses less digits than its factorization.

56736716221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2986142978.

The product of its digits is 635040, while the sum is 46.

The spelling of 56736716221 in words is "fifty-six billion, seven hundred thirty-six million, seven hundred sixteen thousand, two hundred twenty-one".