645034203 has 12 divisors (see below), whose sum is σ = 1016417688. Its totient is φ = 390929760.

The previous prime is 645034193. The next prime is 645034231. The reversal of 645034203 is 302430546.

645034203 is a `hidden beast` number, since 6 + 450 + 3 + 4 + 203 = 666.

It is not a de Polignac number, because 645034203 - 2⁶ = 645034139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645034253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3257650 + ... + 3257847.

It is an arithmetic number, because the mean of its divisors is an integer number (84701474).

Almost surely, 2^645034203 is an apocalyptic number.

645034203 is a deficient number, since it is larger than the sum of its proper divisors (371383485).

645034203 is a wasteful number, since it uses less digits than its factorization.

645034203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6515514 (or 6515511 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 645034203 is about 25397.5235603789. The cubic root of 645034203 is about 864.0275317551.

Adding to 645034203 its reverse (302430546), we get a palindrome (947464749).

The spelling of 645034203 in words is "six hundred forty-five million, thirty-four thousand, two hundred three".