18747786816 has 168 divisors, whose sum is σ = 58920888000. Its totient is φ = 5652218880.

The previous prime is 18747786793. The next prime is 18747786821. The reversal of 18747786816 is 61868774781.

18747786816 is a `hidden beast` number, since 1 + 8 + 7 + 477 + 86 + 81 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1253430 + ... + 1268298.

Almost surely, 2^18747786816 is an apocalyptic number.

18747786816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18747786816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29460444000).

18747786816 is an abundant number, since it is smaller than the sum of its proper divisors (40173101184).

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

18747786816 is a wasteful number, since it uses less digits than its factorization.

18747786816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15097 (or 15084 counting only the distinct ones).

The product of its digits is 25288704, while the sum is 63.

The spelling of 18747786816 in words is "eighteen billion, seven hundred forty-seven million, seven hundred eighty-six thousand, eight hundred sixteen".