168516997 has 4 divisors (see below), whose sum is σ = 183836736. Its totient is φ = 153197260.

The previous prime is 168516991. The next prime is 168517003. The reversal of 168516997 is 799615861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (168516991) and next prime (168517003).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168516997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168516991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7659853 + ... + 7659874.

It is an arithmetic number, because the mean of its divisors is an integer number (45959184).

Almost surely, 2^168516997 is an apocalyptic number.

It is an amenable number.

168516997 is a deficient number, since it is larger than the sum of its proper divisors (15319739).

168516997 is a wasteful number, since it uses less digits than its factorization.

168516997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15319738.

The product of its digits is 816480, while the sum is 52.

The square root of 168516997 is about 12981.4096692154. The cubic root of 168516997 is about 552.3502697527.

The spelling of 168516997 in words is "one hundred sixty-eight million, five hundred sixteen thousand, nine hundred ninety-seven".