11715699490581 has 4 divisors (see below), whose sum is σ = 15620932654112. Its totient is φ = 7810466327052.

The previous prime is 11715699490577. The next prime is 11715699490631. The reversal of 11715699490581 is 18509499651711.

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 11715699490581 - 2² = 11715699490577 is a prime.

It is a super-2 number, since 2×11715699490581² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11715699494581) 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, 1952616581761 + ... + 1952616581766.

It is an arithmetic number, because the mean of its divisors is an integer number (3905233163528).

Almost surely, 2^{11715699490581} is an apocalyptic number.

It is an amenable number.

11715699490581 is a deficient number, since it is larger than the sum of its proper divisors (3905233163531).

11715699490581 is an equidigital number, since it uses as much as digits as its factorization.

11715699490581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905233163530.

The product of its (nonzero) digits is 24494400, while the sum is 66.

The spelling of 11715699490581 in words is "eleven trillion, seven hundred fifteen billion, six hundred ninety-nine million, four hundred ninety thousand, five hundred eighty-one".