18985542733 has 2 divisors, whose sum is σ = 18985542734. Its totient is φ = 18985542732.

The previous prime is 18985542731. The next prime is 18985542743. The reversal of 18985542733 is 33724558981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10071728164 + 8913814569 = 100358^2 + 94413^2 .

It is a cyclic number.

It is not a de Polignac number, because 18985542733 - 2¹ = 18985542731 is a prime.

Together with 18985542731, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18985542731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492771366 + 9492771367.

It is an arithmetic number, because the mean of its divisors is an integer number (9492771367).

Almost surely, 2^18985542733 is an apocalyptic number.

It is an amenable number.

18985542733 is a deficient number, since it is larger than the sum of its proper divisors (1).

18985542733 is an equidigital number, since it uses as much as digits as its factorization.

18985542733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 55.

The spelling of 18985542733 in words is "eighteen billion, nine hundred eighty-five million, five hundred forty-two thousand, seven hundred thirty-three".