18938195211 has 16 divisors (see below), whose sum is σ = 28792913184. Its totient is φ = 10968728064.

The previous prime is 18938195201. The next prime is 18938195231. The reversal of 18938195211 is 11259183981.

It is not a de Polignac number, because 18938195211 - 2⁹ = 18938194699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18938195201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14281536 + ... + 14282861.

It is an arithmetic number, because the mean of its divisors is an integer number (1799557074).

Almost surely, 2^18938195211 is an apocalyptic number.

18938195211 is a deficient number, since it is larger than the sum of its proper divisors (9854717973).

18938195211 is a wasteful number, since it uses less digits than its factorization.

18938195211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28564430.

The product of its digits is 155520, while the sum is 48.

The spelling of 18938195211 in words is "eighteen billion, nine hundred thirty-eight million, one hundred ninety-five thousand, two hundred eleven".