13185915844218 has 64 divisors (see below), whose sum is σ = 28789203824640. Its totient is φ = 4001770888128.

The previous prime is 13185915844207. The next prime is 13185915844261. The reversal of 13185915844218 is 81244851958131.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4968805 + ... + 7145687.

It is an arithmetic number, because the mean of its divisors is an integer number (449831309760).

Almost surely, 2^{13185915844218} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13185915844218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14394601912320).

13185915844218 is an abundant number, since it is smaller than the sum of its proper divisors (15603287980422).

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

13185915844218 is a wasteful number, since it uses less digits than its factorization.

13185915844218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177963.

The product of its digits is 11059200, while the sum is 60.

The spelling of 13185915844218 in words is "thirteen trillion, one hundred eighty-five billion, nine hundred fifteen million, eight hundred forty-four thousand, two hundred eighteen".