6721622736197 has 2 divisors, whose sum is σ = 6721622736198. Its totient is φ = 6721622736196.

The previous prime is 6721622736161. The next prime is 6721622736287. The reversal of 6721622736197 is 7916372261276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5397100263556 + 1324522472641 = 2323166^2 + 1150879^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721622736197 - 2²² = 6721618541893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6721622736797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360811368098 + 3360811368099.

It is an arithmetic number, because the mean of its divisors is an integer number (3360811368099).

Almost surely, 2^{6721622736197} is an apocalyptic number.

It is an amenable number.

6721622736197 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721622736197 is an equidigital number, since it uses as much as digits as its factorization.

6721622736197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16003008, while the sum is 59.

The spelling of 6721622736197 in words is "six trillion, seven hundred twenty-one billion, six hundred twenty-two million, seven hundred thirty-six thousand, one hundred ninety-seven".