56861288761 has 4 divisors (see below), whose sum is σ = 56861809524. Its totient is φ = 56860768000.

The previous prime is 56861288683. The next prime is 56861288767. The reversal of 56861288761 is 16788216865.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22693614736 + 34167674025 = 150644^2 + 184845^2 .

It is a cyclic number.

It is not a de Polignac number, because 56861288761 - 2¹⁵ = 56861255993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56861288696 and 56861288705.

It is not an unprimeable number, because it can be changed into a prime (56861288767) 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 3 ways as a sum of consecutive naturals, for example, 26680 + ... + 338281.

It is an arithmetic number, because the mean of its divisors is an integer number (14215452381).

Almost surely, 2^56861288761 is an apocalyptic number.

It is an amenable number.

56861288761 is a deficient number, since it is larger than the sum of its proper divisors (520763).

56861288761 is a wasteful number, since it uses less digits than its factorization.

56861288761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520762.

The product of its digits is 7741440, while the sum is 58.

The spelling of 56861288761 in words is "fifty-six billion, eight hundred sixty-one million, two hundred eighty-eight thousand, seven hundred sixty-one".