56001000561 has 16 divisors (see below), whose sum is σ = 81814848768. Its totient is φ = 33790480400.

The previous prime is 56001000511. The next prime is 56001000563. The reversal of 56001000561 is 16500010065.

It is a cyclic number.

It is not a de Polignac number, because 56001000561 - 2²⁷ = 55866782833 is a prime.

It is a super-2 number, since 2×56001000561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56001000563) 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 15 ways as a sum of consecutive naturals, for example, 3730395 + ... + 3745376.

It is an arithmetic number, because the mean of its divisors is an integer number (5113428048).

Almost surely, 2^56001000561 is an apocalyptic number.

It is an amenable number.

56001000561 is a deficient number, since it is larger than the sum of its proper divisors (25813848207).

56001000561 is a wasteful number, since it uses less digits than its factorization.

56001000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7476012.

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 56001000561 in words is "fifty-six billion, one million, five hundred sixty-one", and thus it is an aban number.