115515666 has 32 divisors (see below), whose sum is σ = 293374080. Its totient is φ = 33004368.

The previous prime is 115515661. The next prime is 115515667. The reversal of 115515666 is 666515511.

It is a self number, because there is not a number n which added to its sum of digits gives 115515666.

It is not an unprimeable number, because it can be changed into a prime (115515661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152421 + ... + 153176.

It is an arithmetic number, because the mean of its divisors is an integer number (9167940).

Almost surely, 2^115515666 is an apocalyptic number.

115515666 is an abundant number, since it is smaller than the sum of its proper divisors (177858414).

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

115515666 is a wasteful number, since it uses less digits than its factorization.

115515666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305615 (or 305609 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 115515666 is about 10747.8214536714. The cubic root of 115515666 is about 487.0201858937.

The spelling of 115515666 in words is "one hundred fifteen million, five hundred fifteen thousand, six hundred sixty-six".