18500351911 has 2 divisors, whose sum is σ = 18500351912. Its totient is φ = 18500351910.

The previous prime is 18500351899. The next prime is 18500351917. The reversal of 18500351911 is 11915300581.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18500351911 - 2¹⁷ = 18500220839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18500351917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9250175955 + 9250175956.

It is an arithmetic number, because the mean of its divisors is an integer number (9250175956).

Almost surely, 2^18500351911 is an apocalyptic number.

18500351911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18500351911 is an equidigital number, since it uses as much as digits as its factorization.

18500351911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 18500351911 in words is "eighteen billion, five hundred million, three hundred fifty-one thousand, nine hundred eleven".