168181225 has 6 divisors (see below), whose sum is σ = 208544750. Its totient is φ = 134544960.

The previous prime is 168181199. The next prime is 168181229. The reversal of 168181225 is 522181861.

168181225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 56836521 + 111344704 = 7539^2 + 10552^2 .

It is not a de Polignac number, because 168181225 - 2¹⁷ = 168050153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168181229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3363600 + ... + 3363649.

Almost surely, 2^168181225 is an apocalyptic number.

It is an amenable number.

168181225 is a deficient number, since it is larger than the sum of its proper divisors (40363525).

168181225 is an equidigital number, since it uses as much as digits as its factorization.

168181225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6727259 (or 6727254 counting only the distinct ones).

The product of its digits is 7680, while the sum is 34.

The square root of 168181225 is about 12968.4704186731. The cubic root of 168181225 is about 551.9831711333.

It can be divided in two parts, 1681 and 81225, that multiplied together give a square (136539225 = 11685²).

The spelling of 168181225 in words is "one hundred sixty-eight million, one hundred eighty-one thousand, two hundred twenty-five".