8125720585 has 4 divisors (see below), whose sum is σ = 9750864708. Its totient is φ = 6500576464.

The previous prime is 8125720541. The next prime is 8125720597. The reversal of 8125720585 is 5850275218.

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 3638864329 + 4486856256 = 60323^2 + 66984^2 .

It is a cyclic number.

It is not a de Polignac number, because 8125720585 - 2¹³ = 8125712393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 812572054 + ... + 812572063.

It is an arithmetic number, because the mean of its divisors is an integer number (2437716177).

Almost surely, 2^8125720585 is an apocalyptic number.

It is an amenable number.

8125720585 is a deficient number, since it is larger than the sum of its proper divisors (1625144123).

8125720585 is a wasteful number, since it uses less digits than its factorization.

8125720585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625144122.

The product of its (nonzero) digits is 224000, while the sum is 43.

The square root of 8125720585 is about 90142.7788843898. The cubic root of 8125720585 is about 2010.4223088130.

The spelling of 8125720585 in words is "eight billion, one hundred twenty-five million, seven hundred twenty thousand, five hundred eighty-five".