115666505 has 4 divisors (see below), whose sum is σ = 138799812. Its totient is φ = 92533200.

The previous prime is 115666501. The next prime is 115666519. The reversal of 115666505 is 505666511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505666511 = 7 ⋅72238073.

It can be written as a sum of positive squares in 2 ways, for example, as 80335369 + 35331136 = 8963^2 + 5944^2 .

It is not a de Polignac number, because 115666505 - 2² = 115666501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115666501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11566646 + ... + 11566655.

It is an arithmetic number, because the mean of its divisors is an integer number (34699953).

Almost surely, 2^115666505 is an apocalyptic number.

It is an amenable number.

115666505 is a deficient number, since it is larger than the sum of its proper divisors (23133307).

115666505 is an equidigital number, since it uses as much as digits as its factorization.

115666505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23133306.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 115666505 is about 10754.8363539386. The cubic root of 115666505 is about 487.2320754392.

The spelling of 115666505 in words is "one hundred fifteen million, six hundred sixty-six thousand, five hundred five".