18042534549 has 12 divisors (see below), whose sum is σ = 28066165036. Its totient is φ = 11103098112.

The previous prime is 18042534547. The next prime is 18042534569. The reversal of 18042534549 is 94543524081.

18042534549 is a `hidden beast` number, since 1 + 80 + 4 + 25 + 3 + 4 + 549 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2415034449 + 15627500100 = 49143^2 + 125010^2 .

It is not a de Polignac number, because 18042534549 - 2¹ = 18042534547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18042534547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77104732 + ... + 77104965.

Almost surely, 2^18042534549 is an apocalyptic number.

It is an amenable number.

18042534549 is a deficient number, since it is larger than the sum of its proper divisors (10023630487).

18042534549 is a wasteful number, since it uses less digits than its factorization.

18042534549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154209716 (or 154209713 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 18042534549 in words is "eighteen billion, forty-two million, five hundred thirty-four thousand, five hundred forty-nine".