645585217 has 8 divisors (see below), whose sum is σ = 684066816. Its totient is φ = 607159872.

The previous prime is 645585197. The next prime is 645585271. The reversal of 645585217 is 712585546.

645585217 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 645585217 - 2⁷ = 645585089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645585277) 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, 10848 + ... + 37534.

It is an arithmetic number, because the mean of its divisors is an integer number (85508352).

Almost surely, 2^645585217 is an apocalyptic number.

It is an amenable number.

645585217 is a deficient number, since it is larger than the sum of its proper divisors (38481599).

645585217 is a wasteful number, since it uses less digits than its factorization.

645585217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28127.

The product of its digits is 336000, while the sum is 43.

The square root of 645585217 is about 25408.3690346311. The cubic root of 645585217 is about 864.2734906842.

The spelling of 645585217 in words is "six hundred forty-five million, five hundred eighty-five thousand, two hundred seventeen".