66145225 has 6 divisors (see below), whose sum is σ = 82020110. Its totient is φ = 52916160.

The previous prime is 66145207. The next prime is 66145231. The reversal of 66145225 is 52254166.

It can be written as a sum of positive squares in 3 ways, for example, as 21040569 + 45104656 = 4587^2 + 6716^2 .

It is not a de Polignac number, because 66145225 - 2⁹ = 66144713 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, 1322880 + ... + 1322929.

Almost surely, 2^66145225 is an apocalyptic number.

It is an amenable number.

66145225 is a deficient number, since it is larger than the sum of its proper divisors (15874885).

66145225 is a wasteful number, since it uses less digits than its factorization.

66145225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645819 (or 2645814 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 66145225 is about 8132.9714741907. The cubic root of 66145225 is about 404.4201935511.

The spelling of 66145225 in words is "sixty-six million, one hundred forty-five thousand, two hundred twenty-five".