18215852038217 has 16 divisors (see below), whose sum is σ = 20009935672320. Its totient is φ = 16505429648400.

The previous prime is 18215852038211. The next prime is 18215852038243. The reversal of 18215852038217 is 71283025851281.

It is not a de Polignac number, because 18215852038217 - 2¹⁴ = 18215852021833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18215852038211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3490292 + ... + 6972362.

It is an arithmetic number, because the mean of its divisors is an integer number (1250620979520).

Almost surely, 2^{18215852038217} is an apocalyptic number.

It is an amenable number.

18215852038217 is a deficient number, since it is larger than the sum of its proper divisors (1794083634103).

18215852038217 is a wasteful number, since it uses less digits than its factorization.

18215852038217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3494084.

The product of its (nonzero) digits is 2150400, while the sum is 53.

Adding to 18215852038217 its reverse (71283025851281), we get a palindrome (89498877889498).

The spelling of 18215852038217 in words is "eighteen trillion, two hundred fifteen billion, eight hundred fifty-two million, thirty-eight thousand, two hundred seventeen".