85247243549 has 4 divisors (see below), whose sum is σ = 91804723836. Its totient is φ = 78689763264.

The previous prime is 85247243503. The next prime is 85247243579. The reversal of 85247243549 is 94534274258.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35626562500 + 49620681049 = 188750^2 + 222757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85247243549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 85247243549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85247243579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3278740124 + ... + 3278740149.

It is an arithmetic number, because the mean of its divisors is an integer number (22951180959).

Almost surely, 2^85247243549 is an apocalyptic number.

It is an amenable number.

85247243549 is a deficient number, since it is larger than the sum of its proper divisors (6557480287).

85247243549 is a wasteful number, since it uses less digits than its factorization.

85247243549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6557480286.

The product of its digits is 9676800, while the sum is 53.

The spelling of 85247243549 in words is "eighty-five billion, two hundred forty-seven million, two hundred forty-three thousand, five hundred forty-nine".