15115616660 has 24 divisors (see below), whose sum is σ = 32600709960. Its totient is φ = 5882834304.

The previous prime is 15115616617. The next prime is 15115616689. The reversal of 15115616660 is 6661651151.

It can be written as a sum of positive squares in 4 ways, for example, as 1154776324 + 13960840336 = 33982^2 + 118156^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10212515 + ... + 10213994.

It is an arithmetic number, because the mean of its divisors is an integer number (1358362915).

Almost surely, 2^15115616660 is an apocalyptic number.

15115616660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15115616660 is an abundant number, since it is smaller than the sum of its proper divisors (17485093300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15115616660 is a wasteful number, since it uses less digits than its factorization.

15115616660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20426555 (or 20426553 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 15115616660 in words is "fifteen billion, one hundred fifteen million, six hundred sixteen thousand, six hundred sixty".