639342432099647 has 2 divisors, whose sum is σ = 639342432099648. Its totient is φ = 639342432099646.

The previous prime is 639342432099601. The next prime is 639342432099677. The reversal of 639342432099647 is 746990234243936.

639342432099647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639342432099647 - 2¹² = 639342432095551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639342432099677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319671216049823 + 319671216049824.

It is an arithmetic number, because the mean of its divisors is an integer number (319671216049824).

Almost surely, 2^{639342432099647} is an apocalyptic number.

639342432099647 is a deficient number, since it is larger than the sum of its proper divisors (1).

639342432099647 is an equidigital number, since it uses as much as digits as its factorization.

639342432099647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1269789696, while the sum is 71.

The spelling of 639342432099647 in words is "six hundred thirty-nine trillion, three hundred forty-two billion, four hundred thirty-two million, ninety-nine thousand, six hundred forty-seven".