168278225 has 12 divisors (see below), whose sum is σ = 209038704. Its totient is φ = 134381520.

The previous prime is 168278191. The next prime is 168278239. The reversal of 168278225 is 522872861.

It is not a de Polignac number, because 168278225 - 2⁶ = 168278161 is a prime.

It is a super-2 number, since 2×168278225² = 56635122018301250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8942 + ... + 20408.

It is an arithmetic number, because the mean of its divisors is an integer number (17419892).

Almost surely, 2^168278225 is an apocalyptic number.

It is an amenable number.

168278225 is a deficient number, since it is larger than the sum of its proper divisors (40760479).

168278225 is a wasteful number, since it uses less digits than its factorization.

168278225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12064 (or 12059 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 168278225 is about 12972.2097192421. The cubic root of 168278225 is about 552.0892711200.

It can be divided in two parts, 16827 and 8225, that added together give a palindrome (25052).

The spelling of 168278225 in words is "one hundred sixty-eight million, two hundred seventy-eight thousand, two hundred twenty-five".