18744571812 has 24 divisors (see below), whose sum is σ = 43800649312. Its totient is φ = 6239145600.

The previous prime is 18744571793. The next prime is 18744571823. The reversal of 18744571812 is 21817544781.

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, 1121989 + ... + 1138572.

Almost surely, 2^18744571812 is an apocalyptic number.

18744571812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18744571812 is an abundant number, since it is smaller than the sum of its proper divisors (25056077500).

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

18744571812 is a wasteful number, since it uses less digits than its factorization.

18744571812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261259 (or 2261257 counting only the distinct ones).

The product of its digits is 501760, while the sum is 48.

The spelling of 18744571812 in words is "eighteen billion, seven hundred forty-four million, five hundred seventy-one thousand, eight hundred twelve".