115812565581 has 4 divisors (see below), whose sum is σ = 154416754112. Its totient is φ = 77208377052.

The previous prime is 115812565579. The next prime is 115812565613. The reversal of 115812565581 is 185565218511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 115812565581 - 2¹ = 115812565579 is a prime.

It is a super-2 number, since 2×115812565581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115812565581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115812525581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19302094261 + ... + 19302094266.

It is an arithmetic number, because the mean of its divisors is an integer number (38604188528).

Almost surely, 2^115812565581 is an apocalyptic number.

It is an amenable number.

115812565581 is a deficient number, since it is larger than the sum of its proper divisors (38604188531).

115812565581 is an equidigital number, since it uses as much as digits as its factorization.

115812565581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38604188530.

The product of its digits is 480000, while the sum is 48.

The spelling of 115812565581 in words is "one hundred fifteen billion, eight hundred twelve million, five hundred sixty-five thousand, five hundred eighty-one".