18786540844 has 24 divisors (see below), whose sum is σ = 33466312880. Its totient is φ = 9225570816.

The previous prime is 18786540841. The next prime is 18786540869. The reversal of 18786540844 is 44804568781.

It is not an unprimeable number, because it can be changed into a prime (18786540841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13689 + ... + 194320.

Almost surely, 2^18786540844 is an apocalyptic number.

It is an amenable number.

18786540844 is a deficient number, since it is larger than the sum of its proper divisors (14679772036).

18786540844 is a wasteful number, since it uses less digits than its factorization.

18786540844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208417 (or 208415 counting only the distinct ones).

The product of its (nonzero) digits is 6881280, while the sum is 55.

The spelling of 18786540844 in words is "eighteen billion, seven hundred eighty-six million, five hundred forty thousand, eight hundred forty-four".