18985542723 has 64 divisors (see below), whose sum is σ = 33289344000. Its totient is φ = 10463427072.

The previous prime is 18985542679. The next prime is 18985542731. The reversal of 18985542723 is 32724558981.

18985542723 is a `hidden beast` number, since 1 + 8 + 98 + 5 + 542 + 7 + 2 + 3 = 666.

It is not a de Polignac number, because 18985542723 - 2⁸ = 18985542467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18985542723.

It is not an unprimeable number, because it can be changed into a prime (18985542733) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8916523 + ... + 8918651.

It is an arithmetic number, because the mean of its divisors is an integer number (520146000).

Almost surely, 2^18985542723 is an apocalyptic number.

18985542723 is a deficient number, since it is larger than the sum of its proper divisors (14303801277).

18985542723 is a wasteful number, since it uses less digits than its factorization.

18985542723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801 (or 3795 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 18985542723 in words is "eighteen billion, nine hundred eighty-five million, five hundred forty-two thousand, seven hundred twenty-three".