8521708057 has 2 divisors, whose sum is σ = 8521708058. Its totient is φ = 8521708056.

The previous prime is 8521708049. The next prime is 8521708061. The reversal of 8521708057 is 7508071258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5959222416 + 2562485641 = 77196^2 + 50621^2 .

It is a cyclic number.

It is not a de Polignac number, because 8521708057 - 2³ = 8521708049 is a prime.

It is not a weakly prime, because it can be changed into another prime (8521718057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260854028 + 4260854029.

It is an arithmetic number, because the mean of its divisors is an integer number (4260854029).

Almost surely, 2^8521708057 is an apocalyptic number.

It is an amenable number.

8521708057 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521708057 is an equidigital number, since it uses as much as digits as its factorization.

8521708057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156800, while the sum is 43.

The square root of 8521708057 is about 92313.0979709813. The cubic root of 8521708057 is about 2042.5634231058.

The spelling of 8521708057 in words is "eight billion, five hundred twenty-one million, seven hundred eight thousand, fifty-seven".