218432272105891 has 2 divisors, whose sum is σ = 218432272105892. Its totient is φ = 218432272105890.

The previous prime is 218432272105877. The next prime is 218432272105903. The reversal of 218432272105891 is 198501272234812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 218432272105891 - 2¹⁵ = 218432272073123 is a prime.

It is not a weakly prime, because it can be changed into another prime (218432272105811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109216136052945 + 109216136052946.

It is an arithmetic number, because the mean of its divisors is an integer number (109216136052946).

Almost surely, 2^{218432272105891} is an apocalyptic number.

218432272105891 is a deficient number, since it is larger than the sum of its proper divisors (1).

218432272105891 is an equidigital number, since it uses as much as digits as its factorization.

218432272105891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 218432272105891 in words is "two hundred eighteen trillion, four hundred thirty-two billion, two hundred seventy-two million, one hundred five thousand, eight hundred ninety-one".