8505725761 has 4 divisors (see below), whose sum is σ = 9160012372. Its totient is φ = 7851439152.

The previous prime is 8505725741. The next prime is 8505725771. The reversal of 8505725761 is 1675275058.

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 3246720400 + 5259005361 = 56980^2 + 72519^2 .

It is a cyclic number.

It is not a de Polignac number, because 8505725761 - 2⁷ = 8505725633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8505725731) 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 3 ways as a sum of consecutive naturals, for example, 327143286 + ... + 327143311.

It is an arithmetic number, because the mean of its divisors is an integer number (2290003093).

Almost surely, 2^8505725761 is an apocalyptic number.

It is an amenable number.

8505725761 is a deficient number, since it is larger than the sum of its proper divisors (654286611).

8505725761 is a wasteful number, since it uses less digits than its factorization.

8505725761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654286610.

The product of its (nonzero) digits is 588000, while the sum is 46.

The square root of 8505725761 is about 92226.4916442125. The cubic root of 8505725761 is about 2041.2856948006.

The spelling of 8505725761 in words is "eight billion, five hundred five million, seven hundred twenty-five thousand, seven hundred sixty-one".