85539981852 has 192 divisors, whose sum is σ = 252151334400. Its totient is φ = 24860183040.

The previous prime is 85539981823. The next prime is 85539981869. The reversal of 85539981852 is 25818993558.

85539981852 is a `hidden beast` number, since 8 + 5 + 539 + 98 + 1 + 8 + 5 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 85539981852.

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 9251952 + ... + 9261192.

It is an arithmetic number, because the mean of its divisors is an integer number (1313288200).

Almost surely, 2^85539981852 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85539981852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126075667200).

85539981852 is an abundant number, since it is smaller than the sum of its proper divisors (166611352548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85539981852 is a wasteful number, since it uses less digits than its factorization.

85539981852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9633 (or 9625 counting only the distinct ones).

The product of its digits is 31104000, while the sum is 63.

The spelling of 85539981852 in words is "eighty-five billion, five hundred thirty-nine million, nine hundred eighty-one thousand, eight hundred fifty-two".