645960125 has 16 divisors (see below), whose sum is σ = 825827184. Its totient is φ = 504160000.

The previous prime is 645960109. The next prime is 645960127. The reversal of 645960125 is 521069546.

It can be written as a sum of positive squares in 8 ways, for example, as 151831684 + 494128441 = 12322^2 + 22229^2 .

It is not a de Polignac number, because 645960125 - 2⁴ = 645960109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645960127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57896 + ... + 68145.

It is an arithmetic number, because the mean of its divisors is an integer number (51614199).

Almost surely, 2^645960125 is an apocalyptic number.

It is an amenable number.

645960125 is a deficient number, since it is larger than the sum of its proper divisors (179867059).

645960125 is a wasteful number, since it uses less digits than its factorization.

645960125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126097 (or 126087 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 645960125 is about 25415.7456117266. The cubic root of 645960125 is about 864.4407602843.

The spelling of 645960125 in words is "six hundred forty-five million, nine hundred sixty thousand, one hundred twenty-five".