20002117816897 has 2 divisors, whose sum is σ = 20002117816898. Its totient is φ = 20002117816896.

The previous prime is 20002117816873. The next prime is 20002117816913. The reversal of 20002117816897 is 79861871120002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17401587453441 + 2600530363456 = 4171521^2 + 1612616^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002117816897 - 2³⁵ = 19967758078529 is a prime.

It is a super-2 number, since 2×20002117816897² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20002117816097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001058908448 + 10001058908449.

It is an arithmetic number, because the mean of its divisors is an integer number (10001058908449).

Almost surely, 2^{20002117816897} is an apocalyptic number.

It is an amenable number.

20002117816897 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002117816897 is an equidigital number, since it uses as much as digits as its factorization.

20002117816897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 52.

Adding to 20002117816897 its reverse (79861871120002), we get a palindrome (99863988936899).

The spelling of 20002117816897 in words is "twenty trillion, two billion, one hundred seventeen million, eight hundred sixteen thousand, eight hundred ninety-seven".