6506663521639 has 2 divisors, whose sum is σ = 6506663521640. Its totient is φ = 6506663521638.

The previous prime is 6506663521607. The next prime is 6506663521679. The reversal of 6506663521639 is 9361253666056.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6506663521639 - 2⁵ = 6506663521607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6506663521679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3253331760819 + 3253331760820.

It is an arithmetic number, because the mean of its divisors is an integer number (3253331760820).

Almost surely, 2^{6506663521639} is an apocalyptic number.

6506663521639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506663521639 is an equidigital number, since it uses as much as digits as its factorization.

6506663521639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31492800, while the sum is 58.

The spelling of 6506663521639 in words is "six trillion, five hundred six billion, six hundred sixty-three million, five hundred twenty-one thousand, six hundred thirty-nine".