18785645591916 has 72 divisors (see below), whose sum is σ = 50994920254320. Its totient is φ = 5366768281728.

The previous prime is 18785645591899. The next prime is 18785645591917. The reversal of 18785645591916 is 61919554658781.

It is not an unprimeable number, because it can be changed into a prime (18785645591917) 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, 4002886 + ... + 7320818.

It is an arithmetic number, because the mean of its divisors is an integer number (708262781310).

Almost surely, 2^{18785645591916} is an apocalyptic number.

It is an amenable number.

18785645591916 is an abundant number, since it is smaller than the sum of its proper divisors (32209274662404).

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

18785645591916 is a wasteful number, since it uses less digits than its factorization.

18785645591916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327583 (or 3327574 counting only the distinct ones).

The product of its digits is 653184000, while the sum is 75.

The spelling of 18785645591916 in words is "eighteen trillion, seven hundred eighty-five billion, six hundred forty-five million, five hundred ninety-one thousand, nine hundred sixteen".