18195840079 has 2 divisors, whose sum is σ = 18195840080. Its totient is φ = 18195840078.

The previous prime is 18195840007. The next prime is 18195840083. The reversal of 18195840079 is 97004859181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18195840079 - 2⁷ = 18195839951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18195840479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9097920039 + 9097920040.

It is an arithmetic number, because the mean of its divisors is an integer number (9097920040).

Almost surely, 2^18195840079 is an apocalyptic number.

18195840079 is a deficient number, since it is larger than the sum of its proper divisors (1).

18195840079 is an equidigital number, since it uses as much as digits as its factorization.

18195840079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 18195840079 in words is "eighteen billion, one hundred ninety-five million, eight hundred forty thousand, seventy-nine".