18499487066609 has 2 divisors, whose sum is σ = 18499487066610. Its totient is φ = 18499487066608.

The previous prime is 18499487066603. The next prime is 18499487066623. The reversal of 18499487066609 is 90666078499481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15704354488384 + 2795132578225 = 3962872^2 + 1671865^2 .

It is a cyclic number.

It is not a de Polignac number, because 18499487066609 - 2²⁰ = 18499486018033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18499487066609.

It is not a weakly prime, because it can be changed into another prime (18499487066603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9249743533304 + 9249743533305.

It is an arithmetic number, because the mean of its divisors is an integer number (9249743533305).

Almost surely, 2^{18499487066609} is an apocalyptic number.

It is an amenable number.

18499487066609 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499487066609 is an equidigital number, since it uses as much as digits as its factorization.

18499487066609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128701952, while the sum is 77.

The spelling of 18499487066609 in words is "eighteen trillion, four hundred ninety-nine billion, four hundred eighty-seven million, sixty-six thousand, six hundred nine".