199999999999997 has 2 divisors, whose sum is σ = 199999999999998. Its totient is φ = 199999999999996.

The previous prime is 199999999999903. The next prime is 200000000000027. The reversal of 199999999999997 is 799999999999991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199799666772601 + 200333227396 = 14135051^2 + 447586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199999999999997 is a prime.

It is a super-9 number, since 9×199999999999997⁹ (a number of 130 digits) contains 999999999 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199999999999897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999999999998 + 99999999999999.

It is an arithmetic number, because the mean of its divisors is an integer number (99999999999999).

Almost surely, 2^{199999999999997} is an apocalyptic number.

It is an amenable number.

199999999999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

199999999999997 is an equidigital number, since it uses as much as digits as its factorization.

199999999999997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17793060798303, while the sum is 125.

The spelling of 199999999999997 in words is "one hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".