18487012878208 has 64 divisors (see below), whose sum is σ = 42099769353600. Its totient is φ = 7921348572672.

The previous prime is 18487012878179. The next prime is 18487012878223. The reversal of 18487012878208 is 80287821078481.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 18487012878208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2134063 + ... + 6444241.

It is an arithmetic number, because the mean of its divisors is an integer number (657808896150).

Almost surely, 2^{18487012878208} is an apocalyptic number.

It is an amenable number.

18487012878208 is an abundant number, since it is smaller than the sum of its proper divisors (23612756475392).

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

18487012878208 is an equidigital number, since it uses as much as digits as its factorization.

18487012878208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314987 (or 4314975 counting only the distinct ones).

The product of its (nonzero) digits is 25690112, while the sum is 64.

The spelling of 18487012878208 in words is "eighteen trillion, four hundred eighty-seven billion, twelve million, eight hundred seventy-eight thousand, two hundred eight".