15116712561 has 20 divisors (see below), whose sum is σ = 22853835312. Its totient is φ = 9956384568.

The previous prime is 15116712557. The next prime is 15116712593. The reversal of 15116712561 is 16521761151.

15116712561 is a `hidden beast` number, since 1 + 511 + 67 + 1 + 25 + 61 = 666.

It is not a de Polignac number, because 15116712561 - 2² = 15116712557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15116712161) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1117531 + ... + 1130976.

Almost surely, 2^15116712561 is an apocalyptic number.

It is an amenable number.

15116712561 is a deficient number, since it is larger than the sum of its proper divisors (7737122751).

15116712561 is an equidigital number, since it uses as much as digits as its factorization.

15116712561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248602 (or 2248593 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The spelling of 15116712561 in words is "fifteen billion, one hundred sixteen million, seven hundred twelve thousand, five hundred sixty-one".