18195919223 has 2 divisors, whose sum is σ = 18195919224. Its totient is φ = 18195919222.

The previous prime is 18195919219. The next prime is 18195919253. The reversal of 18195919223 is 32291959181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18195919223 - 2² = 18195919219 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18195919253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9097959611 + 9097959612.

It is an arithmetic number, because the mean of its divisors is an integer number (9097959612).

Almost surely, 2^18195919223 is an apocalyptic number.

18195919223 is a deficient number, since it is larger than the sum of its proper divisors (1).

18195919223 is an equidigital number, since it uses as much as digits as its factorization.

18195919223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 50.

The spelling of 18195919223 in words is "eighteen billion, one hundred ninety-five million, nine hundred nineteen thousand, two hundred twenty-three".