18646324940 has 24 divisors (see below), whose sum is σ = 40859773920. Its totient is φ = 7134245888.

The previous prime is 18646324901. The next prime is 18646324951. The reversal of 18646324940 is 4942364681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20267285 + ... + 20268204.

It is an arithmetic number, because the mean of its divisors is an integer number (1702490580).

Almost surely, 2^18646324940 is an apocalyptic number.

18646324940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18646324940 is an abundant number, since it is smaller than the sum of its proper divisors (22213448980).

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

18646324940 is a wasteful number, since it uses less digits than its factorization.

18646324940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40535521 (or 40535519 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 47.

The spelling of 18646324940 in words is "eighteen billion, six hundred forty-six million, three hundred twenty-four thousand, nine hundred forty".