56115635711521 has 6 divisors (see below), whose sum is σ = 58661524666850. Its totient is φ = 53675825462688.

The previous prime is 56115635711503. The next prime is 56115635711537. The reversal of 56115635711521 is 12511753651165.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 55882502211600 + 233133499921 = 7475460^2 + 482839^2 .

It is not a de Polignac number, because 56115635711521 - 2²⁵ = 56115602157089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56115635711591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53039352696 + ... + 53039353753.

Almost surely, 2^{56115635711521} is an apocalyptic number.

It is an amenable number.

56115635711521 is a deficient number, since it is larger than the sum of its proper divisors (2545888955329).

56115635711521 is a wasteful number, since it uses less digits than its factorization.

56115635711521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106078706495 (or 106078706472 counting only the distinct ones).

The product of its digits is 945000, while the sum is 49.

The spelling of 56115635711521 in words is "fifty-six trillion, one hundred fifteen billion, six hundred thirty-five million, seven hundred eleven thousand, five hundred twenty-one".