18539117545 has 8 divisors (see below), whose sum is σ = 23958244296. Its totient is φ = 13690425216.

The previous prime is 18539117533. The next prime is 18539117561. The reversal of 18539117545 is 54571193581.

It can be written as a sum of positive squares in 4 ways, for example, as 157452304 + 18381665241 = 12548^2 + 135579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18539117545 - 2⁷ = 18539117417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142608532 + ... + 142608661.

It is an arithmetic number, because the mean of its divisors is an integer number (2994780537).

Almost surely, 2^18539117545 is an apocalyptic number.

It is an amenable number.

18539117545 is a deficient number, since it is larger than the sum of its proper divisors (5419126751).

18539117545 is a wasteful number, since it uses less digits than its factorization.

18539117545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285217211.

The product of its digits is 756000, while the sum is 49.

The spelling of 18539117545 in words is "eighteen billion, five hundred thirty-nine million, one hundred seventeen thousand, five hundred forty-five".