56856131663 has 4 divisors (see below), whose sum is σ = 58065836640. Its totient is φ = 55646426688.

The previous prime is 56856131621. The next prime is 56856131671. The reversal of 56856131663 is 36613165865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36613165865 = 5 ⋅7322633173.

It is a cyclic number.

It is not a de Polignac number, because 56856131663 - 2⁶ = 56856131599 is a prime.

It is a super-2 number, since 2×56856131663² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56856131693) 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, 604852418 + ... + 604852511.

It is an arithmetic number, because the mean of its divisors is an integer number (14516459160).

Almost surely, 2^56856131663 is an apocalyptic number.

56856131663 is a deficient number, since it is larger than the sum of its proper divisors (1209704977).

56856131663 is a wasteful number, since it uses less digits than its factorization.

56856131663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1209704976.

The product of its digits is 2332800, while the sum is 50.

The spelling of 56856131663 in words is "fifty-six billion, eight hundred fifty-six million, one hundred thirty-one thousand, six hundred sixty-three".