640807003 has 2 divisors, whose sum is σ = 640807004. Its totient is φ = 640807002.

The previous prime is 640806989. The next prime is 640807009. The reversal of 640807003 is 300708046.

640807003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640807003 is a prime.

It is not a weakly prime, because it can be changed into another prime (640807009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320403501 + 320403502.

It is an arithmetic number, because the mean of its divisors is an integer number (320403502).

Almost surely, 2^640807003 is an apocalyptic number.

640807003 is a deficient number, since it is larger than the sum of its proper divisors (1).

640807003 is an equidigital number, since it uses as much as digits as its factorization.

640807003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 640807003 is about 25314.1660538126. The cubic root of 640807003 is about 862.1359395538.

The spelling of 640807003 in words is "six hundred forty million, eight hundred seven thousand, three".