645441717 has 8 divisors (see below), whose sum is σ = 860771296. Its totient is φ = 430203312.

The previous prime is 645441707. The next prime is 645441743. The reversal of 645441717 is 717144546.

645441717 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 not a de Polignac number, because 645441717 - 2¹⁰ = 645440693 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 (645441707) 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, 4078 + ... + 36159.

It is an arithmetic number, because the mean of its divisors is an integer number (107596412).

Almost surely, 2^645441717 is an apocalyptic number.

It is an amenable number.

645441717 is a deficient number, since it is larger than the sum of its proper divisors (215329579).

645441717 is a wasteful number, since it uses less digits than its factorization.

645441717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45587.

The product of its digits is 94080, while the sum is 39.

The square root of 645441717 is about 25405.5450049787. The cubic root of 645441717 is about 864.2094493394.

The spelling of 645441717 in words is "six hundred forty-five million, four hundred forty-one thousand, seven hundred seventeen".