18111784885 has 16 divisors (see below), whose sum is σ = 21925946736. Its totient is φ = 14362103808.

The previous prime is 18111784883. The next prime is 18111784897. The reversal of 18111784885 is 58848711181.

It can be written as a sum of positive squares in 8 ways, for example, as 153908836 + 17957876049 = 12406^2 + 134007^2 .

It is a cyclic number.

It is not a de Polignac number, because 18111784885 - 2¹ = 18111784883 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 (18111784883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233427 + ... + 301183.

It is an arithmetic number, because the mean of its divisors is an integer number (1370371671).

Almost surely, 2^18111784885 is an apocalyptic number.

It is an amenable number.

18111784885 is a deficient number, since it is larger than the sum of its proper divisors (3814161851).

18111784885 is a wasteful number, since it uses less digits than its factorization.

18111784885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68232.

The product of its digits is 573440, while the sum is 52.

The spelling of 18111784885 in words is "eighteen billion, one hundred eleven million, seven hundred eighty-four thousand, eight hundred eighty-five".