645002203 has 4 divisors (see below), whose sum is σ = 645936328. Its totient is φ = 644068080.

The previous prime is 645002153. The next prime is 645002243. The reversal of 645002203 is 302200546.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 645002203 - 2⁹ = 645001691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645002243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466026 + ... + 467407.

It is an arithmetic number, because the mean of its divisors is an integer number (161484082).

Almost surely, 2^645002203 is an apocalyptic number.

645002203 is a deficient number, since it is larger than the sum of its proper divisors (934125).

645002203 is an equidigital number, since it uses as much as digits as its factorization.

645002203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934124.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 645002203 is about 25396.8935698837. The cubic root of 645002203 is about 864.0132434491.

Adding to 645002203 its reverse (302200546), we get a palindrome (947202749).

The spelling of 645002203 in words is "six hundred forty-five million, two thousand, two hundred three".