115651665 has 32 divisors (see below), whose sum is σ = 206058240. Its totient is φ = 61544448.

The previous prime is 115651643. The next prime is 115651667. The reversal of 115651665 is 566156511.

It is not a de Polignac number, because 115651665 - 2⁵ = 115651633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115651667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99729 + ... + 100881.

It is an arithmetic number, because the mean of its divisors is an integer number (6439320).

Almost surely, 2^115651665 is an apocalyptic number.

115651665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115651665 is a deficient number, since it is larger than the sum of its proper divisors (90406575).

115651665 is a wasteful number, since it uses less digits than its factorization.

115651665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910 (or 1904 counting only the distinct ones).

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

The square root of 115651665 is about 10754.1464096413. The cubic root of 115651665 is about 487.2112372739.

The spelling of 115651665 in words is "one hundred fifteen million, six hundred fifty-one thousand, six hundred sixty-five".