639919059970259 has 2 divisors, whose sum is σ = 639919059970260. Its totient is φ = 639919059970258.

The previous prime is 639919059970249. The next prime is 639919059970357. The reversal of 639919059970259 is 952079950919936.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639919059970259 - 2³² = 639914765002963 is a prime.

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, 319959529985129 + 319959529985130.

It is an arithmetic number, because the mean of its divisors is an integer number (319959529985130).

Almost surely, 2^{639919059970259} is an apocalyptic number.

639919059970259 is a deficient number, since it is larger than the sum of its proper divisors (1).

639919059970259 is an equidigital number, since it uses as much as digits as its factorization.

639919059970259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3348078300, while the sum is 83.

The spelling of 639919059970259 in words is "six hundred thirty-nine trillion, nine hundred nineteen billion, fifty-nine million, nine hundred seventy thousand, two hundred fifty-nine".