11979905318 has 4 divisors (see below), whose sum is σ = 17969857980. Its totient is φ = 5989952658.

The previous prime is 11979905303. The next prime is 11979905359. The reversal of 11979905318 is 81350997911.

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

It is a super-2 number, since 2×11979905318² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11979905318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2994976328 + ... + 2994976331.

It is an arithmetic number, because the mean of its divisors is an integer number (4492464495).

Almost surely, 2^11979905318 is an apocalyptic number.

11979905318 is a deficient number, since it is larger than the sum of its proper divisors (5989952662).

11979905318 is an equidigital number, since it uses as much as digits as its factorization.

11979905318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989952661.

The product of its (nonzero) digits is 612360, while the sum is 53.

The spelling of 11979905318 in words is "eleven billion, nine hundred seventy-nine million, nine hundred five thousand, three hundred eighteen".