18104619613 has 2 divisors, whose sum is σ = 18104619614. Its totient is φ = 18104619612.

The previous prime is 18104619571. The next prime is 18104619619. The reversal of 18104619613 is 31691640181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14003882244 + 4100737369 = 118338^2 + 64037^2 .

It is a cyclic number.

It is not a de Polignac number, because 18104619613 - 2²¹ = 18102522461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18104619619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9052309806 + 9052309807.

It is an arithmetic number, because the mean of its divisors is an integer number (9052309807).

Almost surely, 2^18104619613 is an apocalyptic number.

It is an amenable number.

18104619613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18104619613 is an equidigital number, since it uses as much as digits as its factorization.

18104619613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 18104619613 in words is "eighteen billion, one hundred four million, six hundred nineteen thousand, six hundred thirteen".