640417703 has 2 divisors, whose sum is σ = 640417704. Its totient is φ = 640417702.

The previous prime is 640417699. The next prime is 640417717. The reversal of 640417703 is 307714046.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640417703 - 2² = 640417699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640417703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640417733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320208851 + 320208852.

It is an arithmetic number, because the mean of its divisors is an integer number (320208852).

Almost surely, 2^640417703 is an apocalyptic number.

640417703 is a deficient number, since it is larger than the sum of its proper divisors (1).

640417703 is an equidigital number, since it uses as much as digits as its factorization.

640417703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 640417703 is about 25306.4755151720. The cubic root of 640417703 is about 861.9613172887.

The spelling of 640417703 in words is "six hundred forty million, four hundred seventeen thousand, seven hundred three".