56318958561 has 4 divisors (see below), whose sum is σ = 75091944752. Its totient is φ = 37545972372.

The previous prime is 56318958497. The next prime is 56318958581. The reversal of 56318958561 is 16585981365.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 56318958561 - 2⁶ = 56318958497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56318958581) 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, 9386493091 + ... + 9386493096.

It is an arithmetic number, because the mean of its divisors is an integer number (18772986188).

Almost surely, 2^56318958561 is an apocalyptic number.

It is an amenable number.

56318958561 is a deficient number, since it is larger than the sum of its proper divisors (18772986191).

56318958561 is a wasteful number, since it uses less digits than its factorization.

56318958561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18772986190.

The product of its digits is 7776000, while the sum is 57.

The spelling of 56318958561 in words is "fifty-six billion, three hundred eighteen million, nine hundred fifty-eight thousand, five hundred sixty-one".