18399986143 has 16 divisors (see below), whose sum is σ = 23230632960. Its totient is φ = 14156157600.

The previous prime is 18399986141. The next prime is 18399986147. The reversal of 18399986143 is 34168999381.

It is a cyclic number.

It is not a de Polignac number, because 18399986143 - 2¹ = 18399986141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399986141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1506328 + ... + 1518493.

It is an arithmetic number, because the mean of its divisors is an integer number (1451914560).

Almost surely, 2^18399986143 is an apocalyptic number.

18399986143 is a deficient number, since it is larger than the sum of its proper divisors (4830646817).

18399986143 is a wasteful number, since it uses less digits than its factorization.

18399986143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024918.

The product of its digits is 10077696, while the sum is 61.

The spelling of 18399986143 in words is "eighteen billion, three hundred ninety-nine million, nine hundred eighty-six thousand, one hundred forty-three".