11991099318 has 64 divisors (see below), whose sum is σ = 26326798848. Its totient is φ = 3610910720.

The previous prime is 11991099313. The next prime is 11991099319. The reversal of 11991099318 is 81399019911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11991099313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13518271 + ... + 13519157.

It is an arithmetic number, because the mean of its divisors is an integer number (411356232).

Almost surely, 2^11991099318 is an apocalyptic number.

11991099318 is an abundant number, since it is smaller than the sum of its proper divisors (14335699530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11991099318 is a wasteful number, since it uses less digits than its factorization.

11991099318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957.

The product of its (nonzero) digits is 157464, while the sum is 51.

The spelling of 11991099318 in words is "eleven billion, nine hundred ninety-one million, ninety-nine thousand, three hundred eighteen".