18382749889 has 15 divisors (see below), whose sum is σ = 21453018657. Its totient is φ = 15750948276.

The previous prime is 18382749887. The next prime is 18382749899. The reversal of 18382749889 is 98894728381.

The square root of 18382749889 is 135583.

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

It is not a de Polignac number, because 18382749889 - 2¹ = 18382749887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18382749887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6642184 + ... + 6644950.

Almost surely, 2^18382749889 is an apocalyptic number.

18382749889 is the 135583-rd square number.

18382749889 is the 67792-nd centered octagonal number.

It is an amenable number.

18382749889 is a deficient number, since it is larger than the sum of its proper divisors (3070268768).

18382749889 is an frugal number, since it uses more digits than its factorization.

18382749889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562 (or 2774 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 67.

The spelling of 18382749889 in words is "eighteen billion, three hundred eighty-two million, seven hundred forty-nine thousand, eight hundred eighty-nine".