18938195201 has 2 divisors, whose sum is σ = 18938195202. Its totient is φ = 18938195200.

The previous prime is 18938195191. The next prime is 18938195231. The reversal of 18938195201 is 10259183981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14507961601 + 4430233600 = 120449^2 + 66560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18938195201 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18938195231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9469097600 + 9469097601.

It is an arithmetic number, because the mean of its divisors is an integer number (9469097601).

Almost surely, 2^18938195201 is an apocalyptic number.

It is an amenable number.

18938195201 is a deficient number, since it is larger than the sum of its proper divisors (1).

18938195201 is an equidigital number, since it uses as much as digits as its factorization.

18938195201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 47.

The spelling of 18938195201 in words is "eighteen billion, nine hundred thirty-eight million, one hundred ninety-five thousand, two hundred one".