645411203 has 4 divisors (see below), whose sum is σ = 648687600. Its totient is φ = 642134808.

The previous prime is 645411199. The next prime is 645411233. The reversal of 645411203 is 302114546.

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 645411203 - 2² = 645411199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645411233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637903 + ... + 1638296.

It is an arithmetic number, because the mean of its divisors is an integer number (162171900).

Almost surely, 2^645411203 is an apocalyptic number.

645411203 is a deficient number, since it is larger than the sum of its proper divisors (3276397).

645411203 is a wasteful number, since it uses less digits than its factorization.

645411203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276396.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 645411203 is about 25404.9444596913. The cubic root of 645411203 is about 864.1958302927.

Adding to 645411203 its reverse (302114546), we get a palindrome (947525749).

The spelling of 645411203 in words is "six hundred forty-five million, four hundred eleven thousand, two hundred three".