8999998666657 has 2 divisors, whose sum is σ = 8999998666658. Its totient is φ = 8999998666656.

The previous prime is 8999998666621. The next prime is 8999998666679. The reversal of 8999998666657 is 7566668999998.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8065236484096 + 934762182561 = 2839936^2 + 966831^2 .

It is a cyclic number.

It is not a de Polignac number, because 8999998666657 - 2¹¹ = 8999998664609 is a prime.

It is not a weakly prime, because it can be changed into another prime (8999998666157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499999333328 + 4499999333329.

It is an arithmetic number, because the mean of its divisors is an integer number (4499999333329).

Almost surely, 2^{8999998666657} is an apocalyptic number.

It is an amenable number.

8999998666657 is a deficient number, since it is larger than the sum of its proper divisors (1).

8999998666657 is an equidigital number, since it uses as much as digits as its factorization.

8999998666657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 171421608960, while the sum is 97.

The spelling of 8999998666657 in words is "eight trillion, nine hundred ninety-nine billion, nine hundred ninety-eight million, six hundred sixty-six thousand, six hundred fifty-seven".