18916836181407 has 24 divisors (see below), whose sum is σ = 27991554933888. Its totient is φ = 12303286387200.

The previous prime is 18916836181391. The next prime is 18916836181421. The reversal of 18916836181407 is 70418163861981.

18916836181407 is a `hidden beast` number, since 1 + 8 + 9 + 1 + 6 + 8 + 3 + 618 + 1 + 4 + 0 + 7 = 666.

It is not a de Polignac number, because 18916836181407 - 2⁴ = 18916836181391 is a prime.

It is a super-2 number, since 2×18916836181407² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18916836181487) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12720807 + ... + 14129847.

It is an arithmetic number, because the mean of its divisors is an integer number (1166314788912).

Almost surely, 2^{18916836181407} is an apocalyptic number.

18916836181407 is a deficient number, since it is larger than the sum of its proper divisors (9074718752481).

18916836181407 is a wasteful number, since it uses less digits than its factorization.

18916836181407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445471 (or 1445468 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 63.

The spelling of 18916836181407 in words is "eighteen trillion, nine hundred sixteen billion, eight hundred thirty-six million, one hundred eighty-one thousand, four hundred seven".