18272215643 has 16 divisors (see below), whose sum is σ = 20057932800. Its totient is φ = 16507392480.

The previous prime is 18272215613. The next prime is 18272215649. The reversal of 18272215643 is 34651227281.

It is a cyclic number.

It is not a de Polignac number, because 18272215643 - 2⁸ = 18272215387 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 18272215643.

It is not an unprimeable number, because it can be changed into a prime (18272215649) 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, 5352005 + ... + 5355417.

It is an arithmetic number, because the mean of its divisors is an integer number (1253620800).

Almost surely, 2^18272215643 is an apocalyptic number.

18272215643 is a deficient number, since it is larger than the sum of its proper divisors (1785717157).

18272215643 is a wasteful number, since it uses less digits than its factorization.

18272215643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322.

The product of its digits is 161280, while the sum is 41.

The spelling of 18272215643 in words is "eighteen billion, two hundred seventy-two million, two hundred fifteen thousand, six hundred forty-three".