216181831058279 has 2 divisors, whose sum is σ = 216181831058280. Its totient is φ = 216181831058278.

The previous prime is 216181831058261. The next prime is 216181831058381. The reversal of 216181831058279 is 972850138181612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216181831058279 - 2²⁰ = 216181830009703 is a prime.

It is a super-2 number, since 2×216181831058279² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216181831558279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108090915529139 + 108090915529140.

It is an arithmetic number, because the mean of its divisors is an integer number (108090915529140).

Almost surely, 2^{216181831058279} is an apocalyptic number.

216181831058279 is a deficient number, since it is larger than the sum of its proper divisors (1).

216181831058279 is an equidigital number, since it uses as much as digits as its factorization.

216181831058279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 62.

The spelling of 216181831058279 in words is "two hundred sixteen trillion, one hundred eighty-one billion, eight hundred thirty-one million, fifty-eight thousand, two hundred seventy-nine".