18921841208 has 16 divisors (see below), whose sum is σ = 35487564000. Its totient is φ = 9458490816.

The previous prime is 18921841189. The next prime is 18921841219. The reversal of 18921841208 is 80214812981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270413 + ... + 333116.

It is an arithmetic number, because the mean of its divisors is an integer number (2217972750).

Almost surely, 2^18921841208 is an apocalyptic number.

It is an amenable number.

18921841208 is a deficient number, since it is larger than the sum of its proper divisors (16565722792).

18921841208 is a wasteful number, since it uses less digits than its factorization.

18921841208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607454 (or 607450 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 44.

The spelling of 18921841208 in words is "eighteen billion, nine hundred twenty-one million, eight hundred forty-one thousand, two hundred eight".