56131565551 has 4 divisors (see below), whose sum is σ = 56140909704. Its totient is φ = 56122221400.

The previous prime is 56131565531. The next prime is 56131565557. The reversal of 56131565551 is 15556513165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56131565551 - 2²¹ = 56129468399 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56131565498 and 56131565507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56131565557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4663060 + ... + 4675081.

It is an arithmetic number, because the mean of its divisors is an integer number (14035227426).

Almost surely, 2^56131565551 is an apocalyptic number.

56131565551 is a deficient number, since it is larger than the sum of its proper divisors (9344153).

56131565551 is an equidigital number, since it uses as much as digits as its factorization.

56131565551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344152.

The product of its digits is 337500, while the sum is 43.

The spelling of 56131565551 in words is "fifty-six billion, one hundred thirty-one million, five hundred sixty-five thousand, five hundred fifty-one".