18195807193 has 2 divisors, whose sum is σ = 18195807194. Its totient is φ = 18195807192.

The previous prime is 18195807191. The next prime is 18195807239. The reversal of 18195807193 is 39170859181.

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., 17773422489 + 422384704 = 133317^2 + 20552^2 .

It is a cyclic number.

It is not a de Polignac number, because 18195807193 - 2¹ = 18195807191 is a prime.

Together with 18195807191, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18195807193.

It is not a weakly prime, because it can be changed into another prime (18195807191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9097903596 + 9097903597.

It is an arithmetic number, because the mean of its divisors is an integer number (9097903597).

Almost surely, 2^18195807193 is an apocalyptic number.

It is an amenable number.

18195807193 is a deficient number, since it is larger than the sum of its proper divisors (1).

18195807193 is an equidigital number, since it uses as much as digits as its factorization.

18195807193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 52.

The spelling of 18195807193 in words is "eighteen billion, one hundred ninety-five million, eight hundred seven thousand, one hundred ninety-three".