168897997 has 8 divisors (see below), whose sum is σ = 170437176. Its totient is φ = 167365632.

The previous prime is 168897991. The next prime is 168898003. The reversal of 168897997 is 799798861.

It is an interprime number because it is at equal distance from previous prime (168897991) and next prime (168898003).

It can be written as a sum of positive squares in 4 ways, for example, as 13995081 + 154902916 = 3741^2 + 12446^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 168897997 - 2¹¹ = 168895949 is a prime.

It is a super-2 number, since 2×168897997² = 57053066781224018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168897991) 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 7 ways as a sum of consecutive naturals, for example, 56853 + ... + 59749.

It is an arithmetic number, because the mean of its divisors is an integer number (21304647).

Almost surely, 2^168897997 is an apocalyptic number.

It is an amenable number.

168897997 is a deficient number, since it is larger than the sum of its proper divisors (1539179).

168897997 is a wasteful number, since it uses less digits than its factorization.

168897997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407.

The product of its digits is 13716864, while the sum is 64.

The square root of 168897997 is about 12996.0762155352. The cubic root of 168897997 is about 552.7662259209.

The spelling of 168897997 in words is "one hundred sixty-eight million, eight hundred ninety-seven thousand, nine hundred ninety-seven".