8505709357 has 2 divisors, whose sum is σ = 8505709358. Its totient is φ = 8505709356.

The previous prime is 8505709339. The next prime is 8505709361. The reversal of 8505709357 is 7539075058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6865945321 + 1639764036 = 82861^2 + 40494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8505709357 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8505709357.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8505709307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4252854678 + 4252854679.

It is an arithmetic number, because the mean of its divisors is an integer number (4252854679).

Almost surely, 2^8505709357 is an apocalyptic number.

It is an amenable number.

8505709357 is a deficient number, since it is larger than the sum of its proper divisors (1).

8505709357 is an equidigital number, since it uses as much as digits as its factorization.

8505709357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1323000, while the sum is 49.

The square root of 8505709357 is about 92226.4027109374. The cubic root of 8505709357 is about 2041.2843825367.

The spelling of 8505709357 in words is "eight billion, five hundred five million, seven hundred nine thousand, three hundred fifty-seven".