640703519 has 2 divisors, whose sum is σ = 640703520. Its totient is φ = 640703518.

The previous prime is 640703491. The next prime is 640703563. The reversal of 640703519 is 915307046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640703519 - 2¹⁶ = 640637983 is a prime.

It is a super-2 number, since 2×640703519² = 821001998517966722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640703719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320351759 + 320351760.

It is an arithmetic number, because the mean of its divisors is an integer number (320351760).

Almost surely, 2^640703519 is an apocalyptic number.

640703519 is a deficient number, since it is larger than the sum of its proper divisors (1).

640703519 is an equidigital number, since it uses as much as digits as its factorization.

640703519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 640703519 is about 25312.1219774242. The cubic root of 640703519 is about 862.0895282431.

The spelling of 640703519 in words is "six hundred forty million, seven hundred three thousand, five hundred nineteen".