115616661 has 4 divisors (see below), whose sum is σ = 154155552. Its totient is φ = 77077772.

The previous prime is 115616647. The next prime is 115616671. The reversal of 115616661 is 166616511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 115616661 - 2¹⁰ = 115615637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115616621) 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, 19269441 + ... + 19269446.

It is an arithmetic number, because the mean of its divisors is an integer number (38538888).

Almost surely, 2^115616661 is an apocalyptic number.

It is an amenable number.

115616661 is a deficient number, since it is larger than the sum of its proper divisors (38538891).

115616661 is an equidigital number, since it uses as much as digits as its factorization.

115616661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38538890.

The product of its digits is 6480, while the sum is 33.

The square root of 115616661 is about 10752.5188211879. The cubic root of 115616661 is about 487.1620779786.

The spelling of 115616661 in words is "one hundred fifteen million, six hundred sixteen thousand, six hundred sixty-one".