115115661 has 28 divisors (see below), whose sum is σ = 181700320. Its totient is φ = 72695880.

The previous prime is 115115657. The next prime is 115115669. The reversal of 115115661 is 166511511.

It is not a de Polignac number, because 115115661 - 2² = 115115657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115115669) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 9696 + ... + 18006.

Almost surely, 2^115115661 is an apocalyptic number.

It is an amenable number.

115115661 is a deficient number, since it is larger than the sum of its proper divisors (66584659).

115115661 is an frugal number, since it uses more digits than its factorization.

115115661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8348 (or 8333 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The square root of 115115661 is about 10729.1966614467. The cubic root of 115115661 is about 486.4573883339.

The spelling of 115115661 in words is "one hundred fifteen million, one hundred fifteen thousand, six hundred sixty-one".