18220379729843 has 16 divisors (see below), whose sum is σ = 18465468964800. Its totient is φ = 17976620874240.

The previous prime is 18220379729831. The next prime is 18220379729891. The reversal of 18220379729843 is 34892797302281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18220379729843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18220379729843.

It is not an unprimeable number, because it can be changed into a prime (18220379729143) 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, 213238253 + ... + 213323681.

It is an arithmetic number, because the mean of its divisors is an integer number (1154091810300).

Almost surely, 2^{18220379729843} is an apocalyptic number.

18220379729843 is a deficient number, since it is larger than the sum of its proper divisors (245089234957).

18220379729843 is a wasteful number, since it uses less digits than its factorization.

18220379729843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93182.

The product of its (nonzero) digits is 73156608, while the sum is 65.

The spelling of 18220379729843 in words is "eighteen trillion, two hundred twenty billion, three hundred seventy-nine million, seven hundred twenty-nine thousand, eight hundred forty-three".