118638655 has 4 divisors (see below), whose sum is σ = 142366392. Its totient is φ = 94910920.

The previous prime is 118638649. The next prime is 118638659. The reversal of 118638655 is 556836811.

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

It is not a de Polignac number, because 118638655 - 2³ = 118638647 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 (118638659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11863861 + ... + 11863870.

It is an arithmetic number, because the mean of its divisors is an integer number (35591598).

Almost surely, 2^118638655 is an apocalyptic number.

118638655 is a deficient number, since it is larger than the sum of its proper divisors (23727737).

118638655 is an equidigital number, since it uses as much as digits as its factorization.

118638655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23727736.

The product of its digits is 172800, while the sum is 43.

The square root of 118638655 is about 10892.1373017420. The cubic root of 118638655 is about 491.3701137399.

The spelling of 118638655 in words is "one hundred eighteen million, six hundred thirty-eight thousand, six hundred fifty-five".