115566557 has 4 divisors (see below), whose sum is σ = 115661820. Its totient is φ = 115471296.

The previous prime is 115566551. The next prime is 115566587. The reversal of 115566557 is 755665511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96609241 + 18957316 = 9829^2 + 4354^2 .

It is a cyclic number.

It is not a de Polignac number, because 115566557 - 2⁴ = 115566541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115566551) 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, 45788 + ... + 48245.

It is an arithmetic number, because the mean of its divisors is an integer number (28915455).

Almost surely, 2^115566557 is an apocalyptic number.

It is an amenable number.

115566557 is a deficient number, since it is larger than the sum of its proper divisors (95263).

115566557 is an equidigital number, since it uses as much as digits as its factorization.

115566557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95262.

The product of its digits is 157500, while the sum is 41.

The square root of 115566557 is about 10750.1886960183. The cubic root of 115566557 is about 487.0916951135.

The spelling of 115566557 in words is "one hundred fifteen million, five hundred sixty-six thousand, five hundred fifty-seven".