645110003 has 12 divisors (see below), whose sum is σ = 680999088. Its totient is φ = 609956160.

The previous prime is 645109991. The next prime is 645110023. The reversal of 645110003 is 300011546.

It is not a de Polignac number, because 645110003 - 2⁴ = 645109987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645110023) 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 11 ways as a sum of consecutive naturals, for example, 180413 + ... + 183953.

It is an arithmetic number, because the mean of its divisors is an integer number (56749924).

Almost surely, 2^645110003 is an apocalyptic number.

645110003 is a deficient number, since it is larger than the sum of its proper divisors (35889085).

645110003 is an equidigital number, since it uses as much as digits as its factorization.

645110003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742 (or 3653 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 645110003 is about 25399.0157880182. The cubic root of 645110003 is about 864.0613752947.

Adding to 645110003 its reverse (300011546), we get a palindrome (945121549).

The spelling of 645110003 in words is "six hundred forty-five million, one hundred ten thousand, three".