18940497843128 has 32 divisors (see below), whose sum is σ = 35639724092160. Its totient is φ = 9436572925920.

The previous prime is 18940497843103. The next prime is 18940497843229. The reversal of 18940497843128 is 82134879404981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163156001 + ... + 163272047.

It is an arithmetic number, because the mean of its divisors is an integer number (1113741377880).

Almost surely, 2^{18940497843128} is an apocalyptic number.

It is an amenable number.

18940497843128 is a deficient number, since it is larger than the sum of its proper divisors (16699226249032).

18940497843128 is a wasteful number, since it uses less digits than its factorization.

18940497843128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188427 (or 188423 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 68.

The spelling of 18940497843128 in words is "eighteen trillion, nine hundred forty billion, four hundred ninety-seven million, eight hundred forty-three thousand, one hundred twenty-eight".