6421966522913 has 2 divisors, whose sum is σ = 6421966522914. Its totient is φ = 6421966522912.

The previous prime is 6421966522883. The next prime is 6421966522957. The reversal of 6421966522913 is 3192256691246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6001554337249 + 420412185664 = 2449807^2 + 648392^2 .

It is a cyclic number.

It is not a de Polignac number, because 6421966522913 - 2⁶ = 6421966522849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6421966522813) 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, 3210983261456 + 3210983261457.

It is an arithmetic number, because the mean of its divisors is an integer number (3210983261457).

Almost surely, 2^{6421966522913} is an apocalyptic number.

It is an amenable number.

6421966522913 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421966522913 is an equidigital number, since it uses as much as digits as its factorization.

6421966522913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 56.

The spelling of 6421966522913 in words is "six trillion, four hundred twenty-one billion, nine hundred sixty-six million, five hundred twenty-two thousand, nine hundred thirteen".