7071661657 has 2 divisors, whose sum is σ = 7071661658. Its totient is φ = 7071661656.

The previous prime is 7071661633. The next prime is 7071661679. The reversal of 7071661657 is 7561661707.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5894554176 + 1177107481 = 76776^2 + 34309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7071661657 is a prime.

It is not a weakly prime, because it can be changed into another prime (7071661957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3535830828 + 3535830829.

It is an arithmetic number, because the mean of its divisors is an integer number (3535830829).

Almost surely, 2^7071661657 is an apocalyptic number.

It is an amenable number.

7071661657 is a deficient number, since it is larger than the sum of its proper divisors (1).

7071661657 is an equidigital number, since it uses as much as digits as its factorization.

7071661657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 46.

The square root of 7071661657 is about 84093.1724755345. The cubic root of 7071661657 is about 1919.4368336189.

The spelling of 7071661657 in words is "seven billion, seventy-one million, six hundred sixty-one thousand, six hundred fifty-seven".