56561355731 has 8 divisors (see below), whose sum is σ = 56608366080. Its totient is φ = 56514369672.

The previous prime is 56561355709. The next prime is 56561355737. The reversal of 56561355731 is 13755316565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56561355731 - 2¹⁸ = 56561093587 is a prime.

It is a super-2 number, since 2×56561355731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56561355737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10918700 + ... + 10923878.

It is an arithmetic number, because the mean of its divisors is an integer number (7076045760).

Almost surely, 2^56561355731 is an apocalyptic number.

56561355731 is a deficient number, since it is larger than the sum of its proper divisors (47010349).

56561355731 is a wasteful number, since it uses less digits than its factorization.

56561355731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12145.

The product of its digits is 1417500, while the sum is 47.

The spelling of 56561355731 in words is "fifty-six billion, five hundred sixty-one million, three hundred fifty-five thousand, seven hundred thirty-one".