85578844443247 has 2 divisors, whose sum is σ = 85578844443248. Its totient is φ = 85578844443246.

The previous prime is 85578844443221. The next prime is 85578844443289. The reversal of 85578844443247 is 74234444887558.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85578844443247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85578844443247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85578844473247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42789422221623 + 42789422221624.

It is an arithmetic number, because the mean of its divisors is an integer number (42789422221624).

Almost surely, 2^{85578844443247} is an apocalyptic number.

85578844443247 is a deficient number, since it is larger than the sum of its proper divisors (1).

85578844443247 is an equidigital number, since it uses as much as digits as its factorization.

85578844443247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3853516800, while the sum is 73.

The spelling of 85578844443247 in words is "eighty-five trillion, five hundred seventy-eight billion, eight hundred forty-four million, four hundred forty-three thousand, two hundred forty-seven".