18636817099 has 2 divisors, whose sum is σ = 18636817100. Its totient is φ = 18636817098.

The previous prime is 18636816997. The next prime is 18636817117. The reversal of 18636817099 is 99071863681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18636817099 - 2²³ = 18628428491 is a prime.

It is not a weakly prime, because it can be changed into another prime (18636817699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9318408549 + 9318408550.

It is an arithmetic number, because the mean of its divisors is an integer number (9318408550).

Almost surely, 2^18636817099 is an apocalyptic number.

18636817099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18636817099 is an equidigital number, since it uses as much as digits as its factorization.

18636817099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 18636817099 in words is "eighteen billion, six hundred thirty-six million, eight hundred seventeen thousand, ninety-nine".