18707319091 has 2 divisors, whose sum is σ = 18707319092. Its totient is φ = 18707319090.

The previous prime is 18707319011. The next prime is 18707319097. The reversal of 18707319091 is 19091370781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18707319091 - 2⁷ = 18707318963 is a prime.

It is not a weakly prime, because it can be changed into another prime (18707319097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9353659545 + 9353659546.

It is an arithmetic number, because the mean of its divisors is an integer number (9353659546).

Almost surely, 2^18707319091 is an apocalyptic number.

18707319091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18707319091 is an equidigital number, since it uses as much as digits as its factorization.

18707319091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 46.

The spelling of 18707319091 in words is "eighteen billion, seven hundred seven million, three hundred nineteen thousand, ninety-one".