11993455218 has 64 divisors (see below), whose sum is σ = 25044163200. Its totient is φ = 3825661440.

The previous prime is 11993455213. The next prime is 11993455223. The reversal of 11993455218 is 81255439911.

It is an interprime number because it is at equal distance from previous prime (11993455213) and next prime (11993455223).

It is not an unprimeable number, because it can be changed into a prime (11993455213) 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 31 ways as a sum of consecutive naturals, for example, 11218788 + ... + 11219856.

It is an arithmetic number, because the mean of its divisors is an integer number (391315050).

Almost surely, 2^11993455218 is an apocalyptic number.

11993455218 is an abundant number, since it is smaller than the sum of its proper divisors (13050707982).

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

11993455218 is a wasteful number, since it uses less digits than its factorization.

11993455218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947.

The product of its digits is 388800, while the sum is 48.

The spelling of 11993455218 in words is "eleven billion, nine hundred ninety-three million, four hundred fifty-five thousand, two hundred eighteen".