18609125819 has 2 divisors, whose sum is σ = 18609125820. Its totient is φ = 18609125818.

The previous prime is 18609125783. The next prime is 18609125851. The reversal of 18609125819 is 91852190681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18609125819 is a prime.

It is a super-2 number, since 2×18609125819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18609125219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9304562909 + 9304562910.

It is an arithmetic number, because the mean of its divisors is an integer number (9304562910).

Almost surely, 2^18609125819 is an apocalyptic number.

18609125819 is a deficient number, since it is larger than the sum of its proper divisors (1).

18609125819 is an equidigital number, since it uses as much as digits as its factorization.

18609125819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 50.

The spelling of 18609125819 in words is "eighteen billion, six hundred nine million, one hundred twenty-five thousand, eight hundred nineteen".