84865594489 has 9 divisors (see below), whose sum is σ = 91899981453. Its totient is φ = 78333976032.

The previous prime is 84865594459. The next prime is 84865594501. The reversal of 84865594489 is 98449556848.

The square root of 84865594489 is 291317.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 8859515625 + 76006078864 = 94125^2 + 275692^2 .

It is not a de Polignac number, because 84865594489 - 2⁹ = 84865593977 is a prime.

It is a super-2 number, since 2×84865594489² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84865594439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3775917 + ... + 3798325.

Almost surely, 2^84865594489 is an apocalyptic number.

84865594489 is the 291317-th square number.

84865594489 is the 145659-th centered octagonal number.

It is an amenable number.

84865594489 is a deficient number, since it is larger than the sum of its proper divisors (7034386964).

84865594489 is an frugal number, since it uses more digits than its factorization.

84865594489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44844 (or 22422 counting only the distinct ones).

The product of its digits is 398131200, while the sum is 70.

The spelling of 84865594489 in words is "eighty-four billion, eight hundred sixty-five million, five hundred ninety-four thousand, four hundred eighty-nine".