18644617794 has 32 divisors (see below), whose sum is σ = 40773611520. Its totient is φ = 5636766800.

The previous prime is 18644617781. The next prime is 18644617801. The reversal of 18644617794 is 49771644681.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299274 + ... + 356165.

It is an arithmetic number, because the mean of its divisors is an integer number (1274175360).

Almost surely, 2^18644617794 is an apocalyptic number.

18644617794 is an abundant number, since it is smaller than the sum of its proper divisors (22128993726).

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

18644617794 is a wasteful number, since it uses less digits than its factorization.

18644617794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655886.

The product of its digits is 8128512, while the sum is 57.

The spelling of 18644617794 in words is "eighteen billion, six hundred forty-four million, six hundred seventeen thousand, seven hundred ninety-four".