56781857715 has 16 divisors (see below), whose sum is σ = 99110151936. Its totient is φ = 27530597600.

The previous prime is 56781857659. The next prime is 56781857731. The reversal of 56781857715 is 51775818765.

It is not a de Polignac number, because 56781857715 - 2⁶ = 56781857651 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172066071 + ... + 172066400.

It is an arithmetic number, because the mean of its divisors is an integer number (6194384496).

Almost surely, 2^56781857715 is an apocalyptic number.

56781857715 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

56781857715 is a deficient number, since it is larger than the sum of its proper divisors (42328294221).

56781857715 is a wasteful number, since it uses less digits than its factorization.

56781857715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344132490.

The product of its digits is 16464000, while the sum is 60.

The spelling of 56781857715 in words is "fifty-six billion, seven hundred eighty-one million, eight hundred fifty-seven thousand, seven hundred fifteen".