85804221439 has 2 divisors, whose sum is σ = 85804221440. Its totient is φ = 85804221438.

The previous prime is 85804221361. The next prime is 85804221493. The reversal of 85804221439 is 93412240858.

Together with next prime (85804221493) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85804221439 - 2²⁵ = 85770667007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85804221539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42902110719 + 42902110720.

It is an arithmetic number, because the mean of its divisors is an integer number (42902110720).

Almost surely, 2^85804221439 is an apocalyptic number.

85804221439 is a deficient number, since it is larger than the sum of its proper divisors (1).

85804221439 is an equidigital number, since it uses as much as digits as its factorization.

85804221439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 85804221439 in words is "eighty-five billion, eight hundred four million, two hundred twenty-one thousand, four hundred thirty-nine".