18499487016609 has 45 divisors (see below), whose sum is σ = 27175269490239. Its totient is φ = 12127045930560.

The previous prime is 18499487016587. The next prime is 18499487016623. The reversal of 18499487016609 is 90661078499481.

The square root of 18499487016609 is 4301103.

It is a perfect power (a square), and thus also a powerful number.

18499487016609 is a `hidden beast` number, since 1 + 8 + 4 + 9 + 9 + 4 + 8 + 7 + 0 + 1 + 6 + 609 = 666.

It can be written as a sum of positive squares in 7 ways, for example, as 13305737176209 + 5193749840400 = 3647703^2 + 2278980^2 .

It is not a de Polignac number, because 18499487016609 - 2¹³ = 18499487008417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18499487066609) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 102207110499 + ... + 102207110679.

Almost surely, 2^{18499487016609} is an apocalyptic number.

18499487016609 is the 4301103-rd square number.

18499487016609 is the 2150552-nd centered octagonal number.

It is an amenable number.

18499487016609 is a deficient number, since it is larger than the sum of its proper divisors (8675782473630).

18499487016609 is an frugal number, since it uses more digits than its factorization.

18499487016609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 72.

The spelling of 18499487016609 in words is "eighteen trillion, four hundred ninety-nine billion, four hundred eighty-seven million, sixteen thousand, six hundred nine".