56251561791 has 4 divisors (see below), whose sum is σ = 75002082392. Its totient is φ = 37501041192.

The previous prime is 56251561763. The next prime is 56251561837. The reversal of 56251561791 is 19716515265.

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

It is not a de Polignac number, because 56251561791 - 2¹³ = 56251553599 is a prime.

It is a super-2 number, since 2×56251561791² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56251561791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56251561711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9375260296 + ... + 9375260301.

It is an arithmetic number, because the mean of its divisors is an integer number (18750520598).

Almost surely, 2^56251561791 is an apocalyptic number.

56251561791 is a deficient number, since it is larger than the sum of its proper divisors (18750520601).

56251561791 is a wasteful number, since it uses less digits than its factorization.

56251561791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18750520600.

The product of its digits is 567000, while the sum is 48.

The spelling of 56251561791 in words is "fifty-six billion, two hundred fifty-one million, five hundred sixty-one thousand, seven hundred ninety-one".