85644170525 has 12 divisors (see below), whose sum is σ = 106576711764. Its totient is φ = 68271504000.

The previous prime is 85644170509. The next prime is 85644170531. The reversal of 85644170525 is 52507144658.

It can be written as a sum of positive squares in 6 ways, for example, as 1986128356 + 83658042169 = 44566^2 + 289237^2 .

It is not a de Polignac number, because 85644170525 - 2⁴ = 85644170509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85644170525.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6088646 + ... + 6102695.

It is an arithmetic number, because the mean of its divisors is an integer number (8881392647).

Almost surely, 2^85644170525 is an apocalyptic number.

It is an amenable number.

85644170525 is a deficient number, since it is larger than the sum of its proper divisors (20932541239).

85644170525 is a wasteful number, since it uses less digits than its factorization.

85644170525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12191632 (or 12191627 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 47.

The spelling of 85644170525 in words is "eighty-five billion, six hundred forty-four million, one hundred seventy thousand, five hundred twenty-five".