18183819991 has 2 divisors, whose sum is σ = 18183819992. Its totient is φ = 18183819990.

The previous prime is 18183819853. The next prime is 18183820003. The reversal of 18183819991 is 19991838181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18183819991 - 2²⁹ = 17646949079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18183810991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9091909995 + 9091909996.

It is an arithmetic number, because the mean of its divisors is an integer number (9091909996).

Almost surely, 2^18183819991 is an apocalyptic number.

18183819991 is a deficient number, since it is larger than the sum of its proper divisors (1).

18183819991 is an equidigital number, since it uses as much as digits as its factorization.

18183819991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 58.

The spelling of 18183819991 in words is "eighteen billion, one hundred eighty-three million, eight hundred nineteen thousand, nine hundred ninety-one".