16668333516577 has 2 divisors, whose sum is σ = 16668333516578. Its totient is φ = 16668333516576.

The previous prime is 16668333516451. The next prime is 16668333516701. The reversal of 16668333516577 is 77561533386661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15991689079521 + 676644437056 = 3998961^2 + 822584^2 .

It is a cyclic number.

It is not a de Polignac number, because 16668333516577 - 2²³ = 16668325127969 is a prime.

It is not a weakly prime, because it can be changed into another prime (16668333516377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8334166758288 + 8334166758289.

It is an arithmetic number, because the mean of its divisors is an integer number (8334166758289).

Almost surely, 2^{16668333516577} is an apocalyptic number.

It is an amenable number.

16668333516577 is a deficient number, since it is larger than the sum of its proper divisors (1).

16668333516577 is an equidigital number, since it uses as much as digits as its factorization.

16668333516577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 342921600, while the sum is 67.

The spelling of 16668333516577 in words is "sixteen trillion, six hundred sixty-eight billion, three hundred thirty-three million, five hundred sixteen thousand, five hundred seventy-seven".