18818641992 has 16 divisors (see below), whose sum is σ = 47046605040. Its totient is φ = 6272880656.

The previous prime is 18818641987. The next prime is 18818641999. The reversal of 18818641992 is 29914681881.

It is not an unprimeable number, because it can be changed into a prime (18818641999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392055018 + ... + 392055065.

It is an arithmetic number, because the mean of its divisors is an integer number (2940412815).

Almost surely, 2^18818641992 is an apocalyptic number.

18818641992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18818641992 is an abundant number, since it is smaller than the sum of its proper divisors (28227963048).

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

18818641992 is a wasteful number, since it uses less digits than its factorization.

18818641992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784110092 (or 784110088 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 57.

The spelling of 18818641992 in words is "eighteen billion, eight hundred eighteen million, six hundred forty-one thousand, nine hundred ninety-two".