645863325 has 24 divisors (see below), whose sum is σ = 1073815200. Its totient is φ = 342528960.

The previous prime is 645863291. The next prime is 645863329. The reversal of 645863325 is 523368546.

It is not a de Polignac number, because 645863325 - 2⁶ = 645863261 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645863329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10630 + ... + 37479.

It is an arithmetic number, because the mean of its divisors is an integer number (44742300).

Almost surely, 2^645863325 is an apocalyptic number.

It is an amenable number.

645863325 is a deficient number, since it is larger than the sum of its proper divisors (427951875).

645863325 is a wasteful number, since it uses less digits than its factorization.

645863325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48301 (or 48296 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 645863325 is about 25413.8412090735. The cubic root of 645863325 is about 864.3975780286.

The spelling of 645863325 in words is "six hundred forty-five million, eight hundred sixty-three thousand, three hundred twenty-five".