645041225 has 12 divisors (see below), whose sum is σ = 801670416. Its totient is φ = 514859280.

The previous prime is 645041219. The next prime is 645041281. The reversal of 645041225 is 522140546.

It is not a de Polignac number, because 645041225 - 2⁸ = 645040969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 18047 + ... + 40196.

It is an arithmetic number, because the mean of its divisors is an integer number (66805868).

Almost surely, 2^645041225 is an apocalyptic number.

It is an amenable number.

645041225 is a deficient number, since it is larger than the sum of its proper divisors (156629191).

645041225 is a wasteful number, since it uses less digits than its factorization.

645041225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58696 (or 58691 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 645041225 is about 25397.6618018273. The cubic root of 645041225 is about 864.0306670821.

The spelling of 645041225 in words is "six hundred forty-five million, forty-one thousand, two hundred twenty-five".