18912644196 has 24 divisors (see below), whose sum is σ = 44400240864. Its totient is φ = 6265537920.

The previous prime is 18912644183. The next prime is 18912644227. The reversal of 18912644196 is 69144621981.

It is a super-2 number, since 2×18912644196² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4832565 + ... + 4836476.

It is an arithmetic number, because the mean of its divisors is an integer number (1850010036).

Almost surely, 2^18912644196 is an apocalyptic number.

It is an amenable number.

18912644196 is an abundant number, since it is smaller than the sum of its proper divisors (25487596668).

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

18912644196 is a wasteful number, since it uses less digits than its factorization.

18912644196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9669211 (or 9669209 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The spelling of 18912644196 in words is "eighteen billion, nine hundred twelve million, six hundred forty-four thousand, one hundred ninety-six".