6499589721679 has 2 divisors, whose sum is σ = 6499589721680. Its totient is φ = 6499589721678.

The previous prime is 6499589721661. The next prime is 6499589721683. The reversal of 6499589721679 is 9761279859946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6499589721679 - 2⁹ = 6499589721167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6499589721979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3249794860839 + 3249794860840.

It is an arithmetic number, because the mean of its divisors is an integer number (3249794860840).

Almost surely, 2^{6499589721679} is an apocalyptic number.

6499589721679 is a deficient number, since it is larger than the sum of its proper divisors (1).

6499589721679 is an equidigital number, since it uses as much as digits as its factorization.

6499589721679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3703553280, while the sum is 82.

The spelling of 6499589721679 in words is "six trillion, four hundred ninety-nine billion, five hundred eighty-nine million, seven hundred twenty-one thousand, six hundred seventy-nine".