645743303 has 2 divisors, whose sum is σ = 645743304. Its totient is φ = 645743302.

The previous prime is 645743297. The next prime is 645743323. The reversal of 645743303 is 303347546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645743303 - 2⁸ = 645743047 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645743323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322871651 + 322871652.

It is an arithmetic number, because the mean of its divisors is an integer number (322871652).

Almost surely, 2^645743303 is an apocalyptic number.

645743303 is a deficient number, since it is larger than the sum of its proper divisors (1).

645743303 is an equidigital number, since it uses as much as digits as its factorization.

645743303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 35.

The square root of 645743303 is about 25411.4797483342. The cubic root of 645743303 is about 864.3440305007.

The spelling of 645743303 in words is "six hundred forty-five million, seven hundred forty-three thousand, three hundred three".