85221685025 has 6 divisors (see below), whose sum is σ = 105674889462. Its totient is φ = 68177348000.

The previous prime is 85221685009. The next prime is 85221685037. The reversal of 85221685025 is 52058612258.

It can be written as a sum of positive squares in 3 ways, for example, as 5842003489 + 79379681536 = 76433^2 + 281744^2 .

It is not a de Polignac number, because 85221685025 - 2⁴ = 85221685009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1704433676 + ... + 1704433725.

It is an arithmetic number, because the mean of its divisors is an integer number (17612481577).

Almost surely, 2^85221685025 is an apocalyptic number.

It is an amenable number.

85221685025 is a deficient number, since it is larger than the sum of its proper divisors (20453204437).

85221685025 is a wasteful number, since it uses less digits than its factorization.

85221685025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408867411 (or 3408867406 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 44.

The spelling of 85221685025 in words is "eighty-five billion, two hundred twenty-one million, six hundred eighty-five thousand, twenty-five".