639919059970247 has 2 divisors, whose sum is σ = 639919059970248. Its totient is φ = 639919059970246.

The previous prime is 639919059970181. The next prime is 639919059970249. The reversal of 639919059970247 is 742079950919936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639919059970247 - 2³⁸ = 639644182063303 is a prime.

Together with 639919059970249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639919059970249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319959529985123 + 319959529985124.

It is an arithmetic number, because the mean of its divisors is an integer number (319959529985124).

Almost surely, 2^{639919059970247} is an apocalyptic number.

639919059970247 is a deficient number, since it is larger than the sum of its proper divisors (1).

639919059970247 is an equidigital number, since it uses as much as digits as its factorization.

639919059970247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2083248720, while the sum is 80.

The spelling of 639919059970247 in words is "six hundred thirty-nine trillion, nine hundred nineteen billion, fifty-nine million, nine hundred seventy thousand, two hundred forty-seven".