18786187812 has 72 divisors (see below), whose sum is σ = 51827099520. Its totient is φ = 5279480640.

The previous prime is 18786187811. The next prime is 18786187877. The reversal of 18786187812 is 21878168781.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18786187811) 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, 226012 + ... + 297747.

Almost surely, 2^18786187812 is an apocalyptic number.

18786187812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18786187812 is an abundant number, since it is smaller than the sum of its proper divisors (33040911708).

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

18786187812 is a wasteful number, since it uses less digits than its factorization.

18786187812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523841 (or 523832 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 57.

The spelling of 18786187812 in words is "eighteen billion, seven hundred eighty-six million, one hundred eighty-seven thousand, eight hundred twelve".