66670225 has 6 divisors (see below), whose sum is σ = 82671110. Its totient is φ = 53336160.

The previous prime is 66670213. The next prime is 66670267. The reversal of 66670225 is 52207666.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4717584 + 61952641 = 2172^2 + 7871^2 .

It is not a de Polignac number, because 66670225 - 2¹¹ = 66668177 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1333380 + ... + 1333429.

Almost surely, 2^66670225 is an apocalyptic number.

It is an amenable number.

66670225 is a deficient number, since it is larger than the sum of its proper divisors (16000885).

66670225 is a wasteful number, since it uses less digits than its factorization.

66670225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2666819 (or 2666814 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 66670225 is about 8165.1837088947. The cubic root of 66670225 is about 405.4873470772.

The spelling of 66670225 in words is "sixty-six million, six hundred seventy thousand, two hundred twenty-five".