645009195 has 8 divisors (see below), whose sum is σ = 1032014736. Its totient is φ = 344004896.

The previous prime is 645009187. The next prime is 645009199. The reversal of 645009195 is 591900546.

645009195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645009195 - 2³ = 645009187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645009199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21500292 + ... + 21500321.

It is an arithmetic number, because the mean of its divisors is an integer number (129001842).

Almost surely, 2^645009195 is an apocalyptic number.

645009195 is a deficient number, since it is larger than the sum of its proper divisors (387005541).

645009195 is a wasteful number, since it uses less digits than its factorization.

645009195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43000621.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 645009195 is about 25397.0312241411. The cubic root of 645009195 is about 864.0163654843.

The spelling of 645009195 in words is "six hundred forty-five million, nine thousand, one hundred ninety-five".