16218743865 has 16 divisors (see below), whose sum is σ = 26217518208. Its totient is φ = 8560820736.

The previous prime is 16218743831. The next prime is 16218743927. The reversal of 16218743865 is 56834781261.

It is not a de Polignac number, because 16218743865 - 2⁹ = 16218743353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5571997 + ... + 5574906.

It is an arithmetic number, because the mean of its divisors is an integer number (1638594888).

Almost surely, 2^16218743865 is an apocalyptic number.

16218743865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16218743865 is a deficient number, since it is larger than the sum of its proper divisors (9998774343).

16218743865 is a wasteful number, since it uses less digits than its factorization.

16218743865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11147008.

The product of its digits is 1935360, while the sum is 51.

The spelling of 16218743865 in words is "sixteen billion, two hundred eighteen million, seven hundred forty-three thousand, eight hundred sixty-five".