18218733585 has 128 divisors (see below), whose sum is σ = 34124267520. Its totient is φ = 8222155776.

The previous prime is 18218733583. The next prime is 18218733613. The reversal of 18218733585 is 58533781281.

It is not a de Polignac number, because 18218733585 - 2¹ = 18218733583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18218733581) 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 127 ways as a sum of consecutive naturals, for example, 47568304 + ... + 47568686.

It is an arithmetic number, because the mean of its divisors is an integer number (266595840).

Almost surely, 2^18218733585 is an apocalyptic number.

18218733585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18218733585 is a deficient number, since it is larger than the sum of its proper divisors (15905533935).

18218733585 is a wasteful number, since it uses less digits than its factorization.

18218733585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807.

The product of its digits is 1612800, while the sum is 51.

The spelling of 18218733585 in words is "eighteen billion, two hundred eighteen million, seven hundred thirty-three thousand, five hundred eighty-five".