118305661 has 4 divisors (see below), whose sum is σ = 118465632. Its totient is φ = 118145692.

The previous prime is 118305637. The next prime is 118305673. The reversal of 118305661 is 166503811.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166503811 = 37 ⋅4500103.

It is a cyclic number.

It is not a de Polignac number, because 118305661 - 2⁹ = 118305149 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 (118305361) 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, 78871 + ... + 80356.

It is an arithmetic number, because the mean of its divisors is an integer number (29616408).

Almost surely, 2^118305661 is an apocalyptic number.

It is an amenable number.

118305661 is a deficient number, since it is larger than the sum of its proper divisors (159971).

118305661 is an equidigital number, since it uses as much as digits as its factorization.

118305661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159970.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 118305661 is about 10876.8405798743. The cubic root of 118305661 is about 490.9099584212.

The spelling of 118305661 in words is "one hundred eighteen million, three hundred five thousand, six hundred sixty-one".