18680220843264 has 144 divisors (see below), whose sum is σ = 58490152640640. Its totient is φ = 5860461404160.

The previous prime is 18680220843259. The next prime is 18680220843269. The reversal of 18680220843264 is 46234802208681.

18680220843264 is a `hidden beast` number, since 1 + 8 + 6 + 80 + 220 + 84 + 3 + 264 = 666.

It is an interprime number because it is at equal distance from previous prime (18680220843259) and next prime (18680220843269).

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×18680220843264² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 18680220843264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18680220843269) 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, 79370092 + ... + 79605099.

It is an arithmetic number, because the mean of its divisors is an integer number (406181615560).

Almost surely, 2^{18680220843264} is an apocalyptic number.

It is an amenable number.

18680220843264 is an abundant number, since it is smaller than the sum of its proper divisors (39809931797376).

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

18680220843264 is a wasteful number, since it uses less digits than its factorization.

18680220843264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158975233 (or 158975213 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 54.

The spelling of 18680220843264 in words is "eighteen trillion, six hundred eighty billion, two hundred twenty million, eight hundred forty-three thousand, two hundred sixty-four".