6720437846659 has 2 divisors, whose sum is σ = 6720437846660. Its totient is φ = 6720437846658.

The previous prime is 6720437846657. The next prime is 6720437846719. The reversal of 6720437846659 is 9566487340276.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6720437846659 - 2¹ = 6720437846657 is a prime.

Together with 6720437846657, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 6720437846594 and 6720437846603.

It is not a weakly prime, because it can be changed into another prime (6720437846657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360218923329 + 3360218923330.

It is an arithmetic number, because the mean of its divisors is an integer number (3360218923330).

Almost surely, 2^{6720437846659} is an apocalyptic number.

6720437846659 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720437846659 is an equidigital number, since it uses as much as digits as its factorization.

6720437846659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 365783040, while the sum is 67.

The spelling of 6720437846659 in words is "six trillion, seven hundred twenty billion, four hundred thirty-seven million, eight hundred forty-six thousand, six hundred fifty-nine".