18998119061 has 2 divisors, whose sum is σ = 18998119062. Its totient is φ = 18998119060.

The previous prime is 18998119051. The next prime is 18998119073. The reversal of 18998119061 is 16091189981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18684156100 + 313962961 = 136690^2 + 17719^2 .

It is a cyclic number.

It is not a de Polignac number, because 18998119061 - 2³⁴ = 1818249877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18998118994 and 18998119012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18998119051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9499059530 + 9499059531.

It is an arithmetic number, because the mean of its divisors is an integer number (9499059531).

Almost surely, 2^18998119061 is an apocalyptic number.

It is an amenable number.

18998119061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18998119061 is an equidigital number, since it uses as much as digits as its factorization.

18998119061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 53.

The spelling of 18998119061 in words is "eighteen billion, nine hundred ninety-eight million, one hundred nineteen thousand, sixty-one".