639799197911 has 2 divisors, whose sum is σ = 639799197912. Its totient is φ = 639799197910.

The previous prime is 639799197899. The next prime is 639799197953. The reversal of 639799197911 is 119791997936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639799197911 - 2⁶ = 639799197847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639799199911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319899598955 + 319899598956.

It is an arithmetic number, because the mean of its divisors is an integer number (319899598956).

Almost surely, 2^639799197911 is an apocalyptic number.

639799197911 is a deficient number, since it is larger than the sum of its proper divisors (1).

639799197911 is an equidigital number, since it uses as much as digits as its factorization.

639799197911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52081218, while the sum is 71.

The spelling of 639799197911 in words is "six hundred thirty-nine billion, seven hundred ninety-nine million, one hundred ninety-seven thousand, nine hundred eleven".