639703089629 has 2 divisors, whose sum is σ = 639703089630. Its totient is φ = 639703089628.

The previous prime is 639703089593. The next prime is 639703089643. The reversal of 639703089629 is 926980307936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434854519225 + 204848570404 = 659435^2 + 452602^2 .

It is a cyclic number.

It is not a de Polignac number, because 639703089629 - 2⁸ = 639703089373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639703089659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319851544814 + 319851544815.

It is an arithmetic number, because the mean of its divisors is an integer number (319851544815).

Almost surely, 2^639703089629 is an apocalyptic number.

It is an amenable number.

639703089629 is a deficient number, since it is larger than the sum of its proper divisors (1).

639703089629 is an equidigital number, since it uses as much as digits as its factorization.

639703089629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 62.

The spelling of 639703089629 in words is "six hundred thirty-nine billion, seven hundred three million, eighty-nine thousand, six hundred twenty-nine".