56115512221 has 4 divisors (see below), whose sum is σ = 56271823200. Its totient is φ = 55959201244.

The previous prime is 56115512191. The next prime is 56115512237. The reversal of 56115512221 is 12221551165.

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 56115512221 - 2⁷ = 56115512093 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 (56115512261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78154951 + ... + 78155668.

It is an arithmetic number, because the mean of its divisors is an integer number (14067955800).

Almost surely, 2^56115512221 is an apocalyptic number.

It is an amenable number.

56115512221 is a deficient number, since it is larger than the sum of its proper divisors (156310979).

56115512221 is a wasteful number, since it uses less digits than its factorization.

56115512221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156310978.

The product of its digits is 6000, while the sum is 31.

The spelling of 56115512221 in words is "fifty-six billion, one hundred fifteen million, five hundred twelve thousand, two hundred twenty-one".