115666605 has 12 divisors (see below), whose sum is σ = 200488860. Its totient is φ = 61688832.

The previous prime is 115666601. The next prime is 115666619. The reversal of 115666605 is 506666511.

It can be written as a sum of positive squares in 2 ways, for example, as 26193924 + 89472681 = 5118^2 + 9459^2 .

It is not a de Polignac number, because 115666605 - 2² = 115666601 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 115666605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115666601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1285140 + ... + 1285229.

It is an arithmetic number, because the mean of its divisors is an integer number (16707405).

Almost surely, 2^115666605 is an apocalyptic number.

115666605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115666605 is a deficient number, since it is larger than the sum of its proper divisors (84822255).

115666605 is a wasteful number, since it uses less digits than its factorization.

115666605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570380 (or 2570377 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 115666605 is about 10754.8410030088. The cubic root of 115666605 is about 487.2322158520.

The spelling of 115666605 in words is "one hundred fifteen million, six hundred sixty-six thousand, six hundred five".