56561878463 has 4 divisors (see below), whose sum is σ = 56659906560. Its totient is φ = 56463850368.

The previous prime is 56561878459. The next prime is 56561878493. The reversal of 56561878463 is 36487816565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36487816565 = 5 ⋅7297563313.

It is a cyclic number.

It is not a de Polignac number, because 56561878463 - 2² = 56561878459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561878493) 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, 49013183 + ... + 49014336.

It is an arithmetic number, because the mean of its divisors is an integer number (14164976640).

Almost surely, 2^56561878463 is an apocalyptic number.

56561878463 is a deficient number, since it is larger than the sum of its proper divisors (98028097).

56561878463 is an equidigital number, since it uses as much as digits as its factorization.

56561878463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98028096.

The product of its digits is 29030400, while the sum is 59.

The spelling of 56561878463 in words is "fifty-six billion, five hundred sixty-one million, eight hundred seventy-eight thousand, four hundred sixty-three".