18998281695577 has 2 divisors, whose sum is σ = 18998281695578. Its totient is φ = 18998281695576.

The previous prime is 18998281695527. The next prime is 18998281695641. The reversal of 18998281695577 is 77559618289981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13198136789776 + 5800144905801 = 3632924^2 + 2408349^2 .

It is an emirp because it is prime and its reverse (77559618289981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18998281695577 - 2²⁷ = 18998147477849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18998281695494 and 18998281695503.

It is not a weakly prime, because it can be changed into another prime (18998281695517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9499140847788 + 9499140847789.

It is an arithmetic number, because the mean of its divisors is an integer number (9499140847789).

Almost surely, 2^{18998281695577} is an apocalyptic number.

It is an amenable number.

18998281695577 is a deficient number, since it is larger than the sum of its proper divisors (1).

18998281695577 is an equidigital number, since it uses as much as digits as its factorization.

18998281695577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5486745600, while the sum is 85.

The spelling of 18998281695577 in words is "eighteen trillion, nine hundred ninety-eight billion, two hundred eighty-one million, six hundred ninety-five thousand, five hundred seventy-seven".