18449536617 has 36 divisors (see below), whose sum is σ = 29105447280. Its totient is φ = 11646509832.

The previous prime is 18449536597. The next prime is 18449536619. The reversal of 18449536617 is 71663594481.

18449536617 is a `hidden beast` number, since 1 + 8 + 4 + 49 + 536 + 61 + 7 = 666.

It is not a de Polignac number, because 18449536617 - 2³² = 14154569321 is a prime.

Its product of digits (4354560) is a multiple of the sum of its prime factors (4032).

It is not an unprimeable number, because it can be changed into a prime (18449536619) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9228384 + ... + 9230382.

Almost surely, 2^18449536617 is an apocalyptic number.

It is an amenable number.

18449536617 is a deficient number, since it is larger than the sum of its proper divisors (10655910663).

18449536617 is an frugal number, since it uses more digits than its factorization.

18449536617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4032 (or 2021 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 18449536617 in words is "eighteen billion, four hundred forty-nine million, five hundred thirty-six thousand, six hundred seventeen".