18808021694 has 64 divisors (see below), whose sum is σ = 35790004224. Its totient is φ = 7200060000.

The previous prime is 18808021643. The next prime is 18808021697. The reversal of 18808021694 is 49612080881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18808021697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3397709 + ... + 3403239.

It is an arithmetic number, because the mean of its divisors is an integer number (559218816).

Almost surely, 2^18808021694 is an apocalyptic number.

18808021694 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18808021694 is a deficient number, since it is larger than the sum of its proper divisors (16981982530).

18808021694 is a wasteful number, since it uses less digits than its factorization.

18808021694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5933.

The product of its (nonzero) digits is 221184, while the sum is 47.

The spelling of 18808021694 in words is "eighteen billion, eight hundred eight million, twenty-one thousand, six hundred ninety-four".