118357821913 has 4 divisors (see below), whose sum is σ = 118382541220. Its totient is φ = 118333102608.

The previous prime is 118357821851. The next prime is 118357821919. The reversal of 118357821913 is 319128753811.

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 69394311184 + 48963510729 = 263428^2 + 221277^2 .

It is a cyclic number.

It is not a de Polignac number, because 118357821913 - 2²¹ = 118355724761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118357821919) 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, 12352470 + ... + 12362047.

It is an arithmetic number, because the mean of its divisors is an integer number (29595635305).

Almost surely, 2^118357821913 is an apocalyptic number.

It is an amenable number.

118357821913 is a deficient number, since it is larger than the sum of its proper divisors (24719307).

118357821913 is an equidigital number, since it uses as much as digits as its factorization.

118357821913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24719306.

The product of its digits is 362880, while the sum is 49.

The spelling of 118357821913 in words is "one hundred eighteen billion, three hundred fifty-seven million, eight hundred twenty-one thousand, nine hundred thirteen".