66667225 has 27 divisors (see below), whose sum is σ = 87652159. Its totient is φ = 50296400.

The previous prime is 66667193. The next prime is 66667261. The reversal of 66667225 is 52276666.

It is a happy number.

The square root of 66667225 is 8165.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 24000201 + 42667024 = 4899^2 + 6532^2 .

It is not a de Polignac number, because 66667225 - 2⁵ = 66667193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 938940 + ... + 939010.

Almost surely, 2^66667225 is an apocalyptic number.

66667225 is the 8165-th square number.

66667225 is the 4083-rd centered octagonal number.

It is an amenable number.

66667225 is a deficient number, since it is larger than the sum of its proper divisors (20984934).

66667225 is an equidigital number, since it uses as much as digits as its factorization.

66667225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 99 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

The cubic root of 66667225 is about 405.4812650004.

The spelling of 66667225 in words is "sixty-six million, six hundred sixty-seven thousand, two hundred twenty-five".