168997225 has 12 divisors (see below), whose sum is σ = 210361536. Its totient is φ = 134678480.

The previous prime is 168997223. The next prime is 168997247. The reversal of 168997225 is 522799861.

It is not a de Polignac number, because 168997225 - 2¹ = 168997223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168997223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6277 + ... + 19426.

It is an arithmetic number, because the mean of its divisors is an integer number (17530128).

Almost surely, 2^168997225 is an apocalyptic number.

It is an amenable number.

168997225 is a deficient number, since it is larger than the sum of its proper divisors (41364311).

168997225 is a wasteful number, since it uses less digits than its factorization.

168997225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25976 (or 25971 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

The square root of 168997225 is about 12999.8932687926. The cubic root of 168997225 is about 552.8744552468.

The spelling of 168997225 in words is "one hundred sixty-eight million, nine hundred ninety-seven thousand, two hundred twenty-five".