639946711 has 2 divisors, whose sum is σ = 639946712. Its totient is φ = 639946710.

The previous prime is 639946693. The next prime is 639946859. The reversal of 639946711 is 117649936.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639946711 - 2⁷ = 639946583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639946211) 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, 319973355 + 319973356.

It is an arithmetic number, because the mean of its divisors is an integer number (319973356).

Almost surely, 2^639946711 is an apocalyptic number.

639946711 is a deficient number, since it is larger than the sum of its proper divisors (1).

639946711 is an equidigital number, since it uses as much as digits as its factorization.

639946711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 46.

The square root of 639946711 is about 25297.1680430834. The cubic root of 639946711 is about 861.7499570843.

The spelling of 639946711 in words is "six hundred thirty-nine million, nine hundred forty-six thousand, seven hundred eleven".