646245225 has 72 divisors (see below), whose sum is σ = 1237822560. Its totient is φ = 321154560.

The previous prime is 646245199. The next prime is 646245227. The reversal of 646245225 is 522542646.

646245225 is a `hidden beast` number, since 6 + 4 + 624 + 5 + 2 + 25 = 666.

646245225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646245225 - 2¹⁸ = 645983081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646245225.

It is not an unprimeable number, because it can be changed into a prime (646245227) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 408486 + ... + 410064.

It is an arithmetic number, because the mean of its divisors is an integer number (17191980).

Almost surely, 2^646245225 is an apocalyptic number.

It is an amenable number.

646245225 is a deficient number, since it is larger than the sum of its proper divisors (591577335).

646245225 is a wasteful number, since it uses less digits than its factorization.

646245225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719 (or 1711 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 646245225 is about 25421.3537208387. The cubic root of 646245225 is about 864.5679176748.

The spelling of 646245225 in words is "six hundred forty-six million, two hundred forty-five thousand, two hundred twenty-five".