18681327635724 has 144 divisors (see below), whose sum is σ = 51581720683584. Its totient is φ = 5665962355200.

The previous prime is 18681327635717. The next prime is 18681327635731. The reversal of 18681327635724 is 42753672318681.

It is a happy number.

18681327635724 is a `hidden beast` number, since 1 + 8 + 6 + 8 + 1 + 3 + 276 + 357 + 2 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (18681327635717) and next prime (18681327635731).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 166781802 + ... + 166893774.

It is an arithmetic number, because the mean of its divisors is an integer number (358206393636).

Almost surely, 2^{18681327635724} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18681327635724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25790860341792).

18681327635724 is an abundant number, since it is smaller than the sum of its proper divisors (32900393047860).

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

18681327635724 is a wasteful number, since it uses less digits than its factorization.

18681327635724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117088 (or 117083 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 63.

The spelling of 18681327635724 in words is "eighteen trillion, six hundred eighty-one billion, three hundred twenty-seven million, six hundred thirty-five thousand, seven hundred twenty-four".