18451319111 has 2 divisors, whose sum is σ = 18451319112. Its totient is φ = 18451319110.

The previous prime is 18451318987. The next prime is 18451319119. The reversal of 18451319111 is 11191315481.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18451319111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18451319119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9225659555 + 9225659556.

It is an arithmetic number, because the mean of its divisors is an integer number (9225659556).

Almost surely, 2^18451319111 is an apocalyptic number.

18451319111 is a deficient number, since it is larger than the sum of its proper divisors (1).

18451319111 is an equidigital number, since it uses as much as digits as its factorization.

18451319111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 35.

The spelling of 18451319111 in words is "eighteen billion, four hundred fifty-one million, three hundred nineteen thousand, one hundred eleven".