639799127959 has 2 divisors, whose sum is σ = 639799127960. Its totient is φ = 639799127958.

The previous prime is 639799127911. The next prime is 639799127963. The reversal of 639799127959 is 959721997936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639799127959 - 2¹³ = 639799119767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639799127999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319899563979 + 319899563980.

It is an arithmetic number, because the mean of its divisors is an integer number (319899563980).

Almost surely, 2^639799127959 is an apocalyptic number.

639799127959 is a deficient number, since it is larger than the sum of its proper divisors (1).

639799127959 is an equidigital number, since it uses as much as digits as its factorization.

639799127959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 520812180, while the sum is 76.

The spelling of 639799127959 in words is "six hundred thirty-nine billion, seven hundred ninety-nine million, one hundred twenty-seven thousand, nine hundred fifty-nine".