118661665 has 12 divisors (see below), whose sum is σ = 143854164. Its totient is φ = 93965664.

The previous prime is 118661657. The next prime is 118661671. The reversal of 118661665 is 566166811.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 69605649 + 49056016 = 8343^2 + 7004^2 .

It is not a de Polignac number, because 118661665 - 2³ = 118661657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51927 + ... + 54163.

It is an arithmetic number, because the mean of its divisors is an integer number (11987847).

Almost surely, 2^118661665 is an apocalyptic number.

It is an amenable number.

118661665 is a deficient number, since it is larger than the sum of its proper divisors (25192499).

118661665 is an equidigital number, since it uses as much as digits as its factorization.

118661665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2448 (or 2345 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 118661665 is about 10893.1935170546. The cubic root of 118661665 is about 491.4018788096.

It can be divided in two parts, 11866 and 1665, that added together give a palindrome (13531).

The spelling of 118661665 in words is "one hundred eighteen million, six hundred sixty-one thousand, six hundred sixty-five".