115666984815 has 32 divisors (see below), whose sum is σ = 186590179776. Its totient is φ = 61183226880.

The previous prime is 115666984813. The next prime is 115666984831. The reversal of 115666984815 is 518489666511.

It is a happy number.

It is not a de Polignac number, because 115666984815 - 2¹ = 115666984813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115666984813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 955587 + ... + 1069803.

It is an arithmetic number, because the mean of its divisors is an integer number (5830943118).

Almost surely, 2^115666984815 is an apocalyptic number.

115666984815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

115666984815 is a deficient number, since it is larger than the sum of its proper divisors (70923194961).

115666984815 is a wasteful number, since it uses less digits than its factorization.

115666984815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114779.

The product of its digits is 12441600, while the sum is 60.

The spelling of 115666984815 in words is "one hundred fifteen billion, six hundred sixty-six million, nine hundred eighty-four thousand, eight hundred fifteen".