18619427117 has 2 divisors, whose sum is σ = 18619427118. Its totient is φ = 18619427116.

The previous prime is 18619427051. The next prime is 18619427161. The reversal of 18619427117 is 71172491681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9989202916 + 8630224201 = 99946^2 + 92899^2 .

It is a cyclic number.

It is not a de Polignac number, because 18619427117 - 2²⁸ = 18350991661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18619427417) 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, 9309713558 + 9309713559.

It is an arithmetic number, because the mean of its divisors is an integer number (9309713559).

Almost surely, 2^18619427117 is an apocalyptic number.

It is an amenable number.

18619427117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18619427117 is an equidigital number, since it uses as much as digits as its factorization.

18619427117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 47.

The spelling of 18619427117 in words is "eighteen billion, six hundred nineteen million, four hundred twenty-seven thousand, one hundred seventeen".