85081012520 has 128 divisors (see below), whose sum is σ = 224538531840. Its totient is φ = 28412724480.

The previous prime is 85081012507. The next prime is 85081012529. The reversal of 85081012520 is 2521018058.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (85081012529) 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 31 ways as a sum of consecutive naturals, for example, 1624259 + ... + 1675821.

It is an arithmetic number, because the mean of its divisors is an integer number (1754207280).

Almost surely, 2^85081012520 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 85081012520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112269265920).

85081012520 is an abundant number, since it is smaller than the sum of its proper divisors (139457519320).

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

85081012520 is a wasteful number, since it uses less digits than its factorization.

85081012520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51735 (or 51731 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The spelling of 85081012520 in words is "eighty-five billion, eighty-one million, twelve thousand, five hundred twenty".