18311381618260 has 48 divisors (see below), whose sum is σ = 39395768871312. Its totient is φ = 7145185305600.

The previous prime is 18311381618191. The next prime is 18311381618261. The reversal of 18311381618260 is 6281618311381.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3255383015824 + 15055998602436 = 1804268^2 + 3880206^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311381618261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7058290 + ... + 9297430.

It is an arithmetic number, because the mean of its divisors is an integer number (820745184819).

Almost surely, 2^{18311381618260} is an apocalyptic number.

18311381618260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18311381618260 is an abundant number, since it is smaller than the sum of its proper divisors (21084387253052).

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

18311381618260 is a wasteful number, since it uses less digits than its factorization.

18311381618260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249164 (or 2249162 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 18311381618260 in words is "eighteen trillion, three hundred eleven billion, three hundred eighty-one million, six hundred eighteen thousand, two hundred sixty".