18938195193 has 8 divisors (see below), whose sum is σ = 26348793408. Its totient is φ = 12076530224.

The previous prime is 18938195191. The next prime is 18938195201. The reversal of 18938195193 is 39159183981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18938195193 - 2¹ = 18938195191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18938195191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137233230 + ... + 137233367.

It is an arithmetic number, because the mean of its divisors is an integer number (3293599176).

Almost surely, 2^18938195193 is an apocalyptic number.

It is an amenable number.

18938195193 is a deficient number, since it is larger than the sum of its proper divisors (7410598215).

18938195193 is a wasteful number, since it uses less digits than its factorization.

18938195193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274466623.

The product of its digits is 2099520, while the sum is 57.

The spelling of 18938195193 in words is "eighteen billion, nine hundred thirty-eight million, one hundred ninety-five thousand, one hundred ninety-three".