18065890091 has 2 divisors, whose sum is σ = 18065890092. Its totient is φ = 18065890090.

The previous prime is 18065890079. The next prime is 18065890111. The reversal of 18065890091 is 19009856081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18065890091 - 2⁶ = 18065890027 is a prime.

It is not a weakly prime, because it can be changed into another prime (18065890001) 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, 9032945045 + 9032945046.

It is an arithmetic number, because the mean of its divisors is an integer number (9032945046).

Almost surely, 2^18065890091 is an apocalyptic number.

18065890091 is a deficient number, since it is larger than the sum of its proper divisors (1).

18065890091 is an equidigital number, since it uses as much as digits as its factorization.

18065890091 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 18065890091 in words is "eighteen billion, sixty-five million, eight hundred ninety thousand, ninety-one".