18916836181408 has 48 divisors (see below), whose sum is σ = 40683182813280. Its totient is φ = 8586926380800.

The previous prime is 18916836181391. The next prime is 18916836181421. The reversal of 18916836181408 is 80418163861981.

It is a super-2 number, since 2×18916836181408² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18916836181408.

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, 36100503 + ... + 36620758.

It is an arithmetic number, because the mean of its divisors is an integer number (847566308610).

Almost surely, 2^{18916836181408} is an apocalyptic number.

It is an amenable number.

18916836181408 is an abundant number, since it is smaller than the sum of its proper divisors (21766346631872).

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

18916836181408 is a wasteful number, since it uses less digits than its factorization.

18916836181408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72722021 (or 72722013 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 64.

The spelling of 18916836181408 in words is "eighteen trillion, nine hundred sixteen billion, eight hundred thirty-six million, one hundred eighty-one thousand, four hundred eight".