640700003 has 2 divisors, whose sum is σ = 640700004. Its totient is φ = 640700002.

The previous prime is 640699993. The next prime is 640700041. The reversal of 640700003 is 300007046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640700003 - 2⁸ = 640699747 is a prime.

It is not a weakly prime, because it can be changed into another prime (640700303) 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 as a sum of consecutive naturals, namely, 320350001 + 320350002.

It is an arithmetic number, because the mean of its divisors is an integer number (320350002).

Almost surely, 2^640700003 is an apocalyptic number.

640700003 is a deficient number, since it is larger than the sum of its proper divisors (1).

640700003 is an equidigital number, since it uses as much as digits as its factorization.

640700003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 640700003 is about 25312.0525244398. The cubic root of 640700003 is about 862.0879512723.

Adding to 640700003 its reverse (300007046), we get a palindrome (940707049).

The spelling of 640700003 in words is "six hundred forty million, seven hundred thousand, three".