11989812018 has 8 divisors (see below), whose sum is σ = 23979624048. Its totient is φ = 3996604004.

The previous prime is 11989812017. The next prime is 11989812047. The reversal of 11989812018 is 81021898911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

11989812018 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11989812011) 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, 999150996 + ... + 999151007.

It is an arithmetic number, because the mean of its divisors is an integer number (2997453006).

Almost surely, 2^11989812018 is an apocalyptic number.

11989812018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11989812018 is a wasteful number, since it uses less digits than its factorization.

11989812018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998302008.

The product of its (nonzero) digits is 82944, while the sum is 48.

The spelling of 11989812018 in words is "eleven billion, nine hundred eighty-nine million, eight hundred twelve thousand, eighteen".