201117817697 has 2 divisors, whose sum is σ = 201117817698. Its totient is φ = 201117817696.

The previous prime is 201117817673. The next prime is 201117817699. The reversal of 201117817697 is 796718711102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180311486161 + 20806331536 = 424631^2 + 144244^2 .

It is a cyclic number.

It is not a de Polignac number, because 201117817697 - 2⁸ = 201117817441 is a prime.

Together with 201117817699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201117817699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100558908848 + 100558908849.

It is an arithmetic number, because the mean of its divisors is an integer number (100558908849).

Almost surely, 2^201117817697 is an apocalyptic number.

It is an amenable number.

201117817697 is a deficient number, since it is larger than the sum of its proper divisors (1).

201117817697 is an equidigital number, since it uses as much as digits as its factorization.

201117817697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 50.

The spelling of 201117817697 in words is "two hundred one billion, one hundred seventeen million, eight hundred seventeen thousand, six hundred ninety-seven".