18613963844 has 12 divisors (see below), whose sum is σ = 37227927744. Its totient is φ = 7977413064.

The previous prime is 18613963843. The next prime is 18613963847. The reversal of 18613963844 is 44836931681.

18613963844 is an admirable number.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18613963843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332392184 + ... + 332392239.

It is an arithmetic number, because the mean of its divisors is an integer number (3102327312).

Almost surely, 2^18613963844 is an apocalyptic number.

18613963844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18613963844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18613963844 is a wasteful number, since it uses less digits than its factorization.

18613963844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664784434 (or 664784432 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 53.

The spelling of 18613963844 in words is "eighteen billion, six hundred thirteen million, nine hundred sixty-three thousand, eight hundred forty-four".