645900303 has 4 divisors (see below), whose sum is σ = 861200408. Its totient is φ = 430600200.

The previous prime is 645900263. The next prime is 645900361. The reversal of 645900303 is 303009546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 645900303 - 2¹⁶ = 645834767 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 (645900803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107650048 + ... + 107650053.

It is an arithmetic number, because the mean of its divisors is an integer number (215300102).

Almost surely, 2^645900303 is an apocalyptic number.

645900303 is a deficient number, since it is larger than the sum of its proper divisors (215300105).

645900303 is a wasteful number, since it uses less digits than its factorization.

645900303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215300104.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 645900303 is about 25414.5687156009. The cubic root of 645900303 is about 864.4140743380.

Adding to 645900303 its reverse (303009546), we get a palindrome (948909849).

The spelling of 645900303 in words is "six hundred forty-five million, nine hundred thousand, three hundred three".