168646999897 has 2 divisors, whose sum is σ = 168646999898. Its totient is φ = 168646999896.

The previous prime is 168646999861. The next prime is 168646999919. The reversal of 168646999897 is 798999646861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163063323721 + 5583676176 = 403811^2 + 74724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168646999897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168646999897.

It is not a weakly prime, because it can be changed into another prime (168646999097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84323499948 + 84323499949.

It is an arithmetic number, because the mean of its divisors is an integer number (84323499949).

Almost surely, 2^168646999897 is an apocalyptic number.

It is an amenable number.

168646999897 is a deficient number, since it is larger than the sum of its proper divisors (1).

168646999897 is an equidigital number, since it uses as much as digits as its factorization.

168646999897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2539579392, while the sum is 82.

The spelling of 168646999897 in words is "one hundred sixty-eight billion, six hundred forty-six million, nine hundred ninety-nine thousand, eight hundred ninety-seven".