8505725771 has 2 divisors, whose sum is σ = 8505725772. Its totient is φ = 8505725770.

The previous prime is 8505725741. The next prime is 8505725819. The reversal of 8505725771 is 1775275058.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8505725771 - 2¹⁸ = 8505463627 is a prime.

It is not a weakly prime, because it can be changed into another prime (8505725731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4252862885 + 4252862886.

It is an arithmetic number, because the mean of its divisors is an integer number (4252862886).

Almost surely, 2^8505725771 is an apocalyptic number.

8505725771 is a deficient number, since it is larger than the sum of its proper divisors (1).

8505725771 is an equidigital number, since it uses as much as digits as its factorization.

8505725771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 686000, while the sum is 47.

The square root of 8505725771 is about 92226.4916984269. The cubic root of 8505725771 is about 2041.2856956006.

The spelling of 8505725771 in words is "eight billion, five hundred five million, seven hundred twenty-five thousand, seven hundred seventy-one".