56221513887 has 32 divisors (see below), whose sum is σ = 93727065600. Its totient is φ = 29122254720.

The previous prime is 56221513853. The next prime is 56221513921. The reversal of 56221513887 is 78831512265.

It is an interprime number because it is at equal distance from previous prime (56221513853) and next prime (56221513921).

It is not a de Polignac number, because 56221513887 - 2¹⁰ = 56221512863 is a prime.

It is a super-2 number, since 2×56221513887² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56221513837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268068 + ... + 429305.

It is an arithmetic number, because the mean of its divisors is an integer number (2928970800).

Almost surely, 2^56221513887 is an apocalyptic number.

56221513887 is a deficient number, since it is larger than the sum of its proper divisors (37505551713).

56221513887 is a wasteful number, since it uses less digits than its factorization.

56221513887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697743.

The product of its digits is 806400, while the sum is 48.

The spelling of 56221513887 in words is "fifty-six billion, two hundred twenty-one million, five hundred thirteen thousand, eight hundred eighty-seven".