639448412591 has 2 divisors, whose sum is σ = 639448412592. Its totient is φ = 639448412590.

The previous prime is 639448412513. The next prime is 639448412693. The reversal of 639448412591 is 195214844936.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639448412591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639448472591) 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, 319724206295 + 319724206296.

It is an arithmetic number, because the mean of its divisors is an integer number (319724206296).

Almost surely, 2^639448412591 is an apocalyptic number.

639448412591 is a deficient number, since it is larger than the sum of its proper divisors (1).

639448412591 is an equidigital number, since it uses as much as digits as its factorization.

639448412591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 56.

The spelling of 639448412591 in words is "six hundred thirty-nine billion, four hundred forty-eight million, four hundred twelve thousand, five hundred ninety-one".