56518755781565 has 32 divisors (see below), whose sum is σ = 84996054832896. Its totient is φ = 35049919426560.

The previous prime is 56518755781529. The next prime is 56518755781619.

56518755781565 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 56518755781565 - 2²⁰ = 56518754732989 is a prime.

It is a super-2 number, since 2×56518755781565² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56518755781492 and 56518755781501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380241662 + ... + 380390271.

It is an arithmetic number, because the mean of its divisors is an integer number (2656126713528).

Almost surely, 2^{56518755781565} is an apocalyptic number.

56518755781565 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56518755781565 is a deficient number, since it is larger than the sum of its proper divisors (28477299051331).

56518755781565 is a wasteful number, since it uses less digits than its factorization.

56518755781565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760632149.

The product of its digits is 1764000000, while the sum is 74.

The spelling of 56518755781565 in words is "fifty-six trillion, five hundred eighteen billion, seven hundred fifty-five million, seven hundred eighty-one thousand, five hundred sixty-five".