640701703 has 2 divisors, whose sum is σ = 640701704. Its totient is φ = 640701702.

The previous prime is 640701671. The next prime is 640701739. The reversal of 640701703 is 307107046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640701703 - 2⁵ = 640701671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640701773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320350851 + 320350852.

It is an arithmetic number, because the mean of its divisors is an integer number (320350852).

Almost surely, 2^640701703 is an apocalyptic number.

640701703 is a deficient number, since it is larger than the sum of its proper divisors (1).

640701703 is an equidigital number, since it uses as much as digits as its factorization.

640701703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 640701703 is about 25312.0861052581. The cubic root of 640701703 is about 862.0887137447.

Adding to 640701703 its reverse (307107046), we get a palindrome (947808749).

The spelling of 640701703 in words is "six hundred forty million, seven hundred one thousand, seven hundred three".