56821356858 has 32 divisors (see below), whose sum is σ = 131026755456. Its totient is φ = 16091002368.

The previous prime is 56821356821. The next prime is 56821356859. The reversal of 56821356858 is 85865312865.

56821356858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 56821356798 and 56821356807.

It is not an unprimeable number, because it can be changed into a prime (56821356859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5981491 + ... + 5990982.

It is an arithmetic number, because the mean of its divisors is an integer number (4094586108).

Almost surely, 2^56821356858 is an apocalyptic number.

56821356858 is an abundant number, since it is smaller than the sum of its proper divisors (74205398598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56821356858 is a wasteful number, since it uses less digits than its factorization.

56821356858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11972598.

The product of its digits is 13824000, while the sum is 57.

The spelling of 56821356858 in words is "fifty-six billion, eight hundred twenty-one million, three hundred fifty-six thousand, eight hundred fifty-eight".