118417645921 has 4 divisors (see below), whose sum is σ = 118419996052. Its totient is φ = 118415295792.

The previous prime is 118417645919. The next prime is 118417645933. The reversal of 118417645921 is 129546714811.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82607382225 + 35810263696 = 287415^2 + 189236^2 .

It is a cyclic number.

It is not a de Polignac number, because 118417645921 - 2¹ = 118417645919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118417645991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1097790 + ... + 1200823.

It is an arithmetic number, because the mean of its divisors is an integer number (29604999013).

Almost surely, 2^118417645921 is an apocalyptic number.

It is an amenable number.

118417645921 is a deficient number, since it is larger than the sum of its proper divisors (2350131).

118417645921 is an equidigital number, since it uses as much as digits as its factorization.

118417645921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350130.

The product of its digits is 483840, while the sum is 49.

The spelling of 118417645921 in words is "one hundred eighteen billion, four hundred seventeen million, six hundred forty-five thousand, nine hundred twenty-one".