18691794486 has 12 divisors (see below), whose sum is σ = 40498888092. Its totient is φ = 6230598156.

The previous prime is 18691794479. The next prime is 18691794487. The reversal of 18691794486 is 68449719681.

18691794486 is a `hidden beast` number, since 1 + 8 + 69 + 1 + 7 + 94 + 486 = 666.

It is a super-2 number, since 2×18691794486² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18691794487) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 519216496 + ... + 519216531.

It is an arithmetic number, because the mean of its divisors is an integer number (3374907341).

Almost surely, 2^18691794486 is an apocalyptic number.

18691794486 is an abundant number, since it is smaller than the sum of its proper divisors (21807093606).

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

18691794486 is a wasteful number, since it uses less digits than its factorization.

18691794486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038433035 (or 1038433032 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The spelling of 18691794486 in words is "eighteen billion, six hundred ninety-one million, seven hundred ninety-four thousand, four hundred eighty-six".