18248399539 has 18 divisors (see below), whose sum is σ = 20416439420. Its totient is φ = 16262093376.

The previous prime is 18248399527. The next prime is 18248399557. The reversal of 18248399539 is 93599384281.

It is not a de Polignac number, because 18248399539 - 2¹³ = 18248391347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18248399509) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10009182 + ... + 10011004.

Almost surely, 2^18248399539 is an apocalyptic number.

18248399539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18248399539 is a deficient number, since it is larger than the sum of its proper divisors (2168039881).

18248399539 is an frugal number, since it uses more digits than its factorization.

18248399539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3699 (or 1859 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 61.

The spelling of 18248399539 in words is "eighteen billion, two hundred forty-eight million, three hundred ninety-nine thousand, five hundred thirty-nine".