115666689 has 16 divisors (see below), whose sum is σ = 158203584. Its totient is φ = 75129600.

The previous prime is 115666669. The next prime is 115666693. The reversal of 115666689 is 986666511.

It is not a de Polignac number, because 115666689 - 2²⁵ = 82112257 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (115666619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66349 + ... + 68069.

It is an arithmetic number, because the mean of its divisors is an integer number (9887724).

Almost surely, 2^115666689 is an apocalyptic number.

It is an amenable number.

115666689 is a deficient number, since it is larger than the sum of its proper divisors (42536895).

115666689 is a wasteful number, since it uses less digits than its factorization.

115666689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288.

The product of its digits is 466560, while the sum is 48.

The square root of 115666689 is about 10754.8449082262. The cubic root of 115666689 is about 487.2323337988.

The spelling of 115666689 in words is "one hundred fifteen million, six hundred sixty-six thousand, six hundred eighty-nine".