645600825 has 36 divisors (see below), whose sum is σ = 1160543280. Its totient is φ = 343069920.

The previous prime is 645600821. The next prime is 645600841. The reversal of 645600825 is 528006546.

645600825 is a `hidden beast` number, since 6 + 45 + 600 + 8 + 2 + 5 = 666.

It is not a de Polignac number, because 645600825 - 2² = 645600821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645600825.

It is not an unprimeable number, because it can be changed into a prime (645600821) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 58606 + ... + 68744.

Almost surely, 2^645600825 is an apocalyptic number.

It is an amenable number.

645600825 is a deficient number, since it is larger than the sum of its proper divisors (514942455).

645600825 is a wasteful number, since it uses less digits than its factorization.

645600825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10438 (or 10430 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 645600825 is about 25408.6761756688. The cubic root of 645600825 is about 864.2804556681.

The spelling of 645600825 in words is "six hundred forty-five million, six hundred thousand, eight hundred twenty-five".