9666988057 has 2 divisors, whose sum is σ = 9666988058. Its totient is φ = 9666988056.

The previous prime is 9666988043. The next prime is 9666988061. The reversal of 9666988057 is 7508896669.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8586616896 + 1080371161 = 92664^2 + 32869^2 .

It is a cyclic number.

It is not a de Polignac number, because 9666988057 - 2¹⁵ = 9666955289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9666988057.

It is not a weakly prime, because it can be changed into another prime (9666988007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4833494028 + 4833494029.

It is an arithmetic number, because the mean of its divisors is an integer number (4833494029).

Almost surely, 2^9666988057 is an apocalyptic number.

It is an amenable number.

9666988057 is a deficient number, since it is larger than the sum of its proper divisors (1).

9666988057 is an equidigital number, since it uses as much as digits as its factorization.

9666988057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 64.

The square root of 9666988057 is about 98320.8424343486. The cubic root of 9666988057 is about 2130.2491172699.

The spelling of 9666988057 in words is "nine billion, six hundred sixty-six million, nine hundred eighty-eight thousand, fifty-seven".