56172220520 has 32 divisors (see below), whose sum is σ = 136109612520. Its totient is φ = 20740512000.

The previous prime is 56172220513. The next prime is 56172220537. The reversal of 56172220520 is 2502227165.

It can be written as a sum of positive squares in 4 ways, for example, as 34729304164 + 21442916356 = 186358^2 + 146434^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54011231 + ... + 54012270.

Almost surely, 2^56172220520 is an apocalyptic number.

It is an amenable number.

56172220520 is an abundant number, since it is smaller than the sum of its proper divisors (79937392000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56172220520 is a wasteful number, since it uses less digits than its factorization.

56172220520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108023525 (or 108023521 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

Adding to 56172220520 its reverse (2502227165), we get a palindrome (58674447685).

The spelling of 56172220520 in words is "fifty-six billion, one hundred seventy-two million, two hundred twenty thousand, five hundred twenty".