115565566 has 4 divisors (see below), whose sum is σ = 173348352. Its totient is φ = 57782782.

The previous prime is 115565539. The next prime is 115565579. The reversal of 115565566 is 665565511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665565511 = 13 ⋅51197347.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28891390 + ... + 28891393.

It is an arithmetic number, because the mean of its divisors is an integer number (43337088).

Almost surely, 2^115565566 is an apocalyptic number.

115565566 is a deficient number, since it is larger than the sum of its proper divisors (57782786).

115565566 is an equidigital number, since it uses as much as digits as its factorization.

115565566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57782785.

The product of its digits is 135000, while the sum is 40.

The square root of 115565566 is about 10750.1426037053. The cubic root of 115565566 is about 487.0903028156.

Subtracting 115565566 from its reverse (665565511), we obtain a palindrome (549999945).

The spelling of 115565566 in words is "one hundred fifteen million, five hundred sixty-five thousand, five hundred sixty-six".