56551211631 has 24 divisors (see below), whose sum is σ = 82200852864. Its totient is φ = 37463322960.

The previous prime is 56551211609. The next prime is 56551211663. The reversal of 56551211631 is 13611215565.

56551211631 is a `hidden beast` number, since 5 + 6 + 5 + 5 + 1 + 2 + 11 + 631 = 666.

It is not a de Polignac number, because 56551211631 - 2¹⁰ = 56551210607 is a prime.

It is a super-2 number, since 2×56551211631² (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 (56551211531) 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 23 ways as a sum of consecutive naturals, for example, 1205640 + ... + 1251666.

It is an arithmetic number, because the mean of its divisors is an integer number (3425035536).

Almost surely, 2^56551211631 is an apocalyptic number.

56551211631 is a deficient number, since it is larger than the sum of its proper divisors (25649641233).

56551211631 is a wasteful number, since it uses less digits than its factorization.

56551211631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46891 (or 46888 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 56551211631 in words is "fifty-six billion, five hundred fifty-one million, two hundred eleven thousand, six hundred thirty-one".