6680066621 has 2 divisors, whose sum is σ = 6680066622. Its totient is φ = 6680066620.

The previous prime is 6680066609. The next prime is 6680066623. The reversal of 6680066621 is 1266600866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4659564121 + 2020502500 = 68261^2 + 44950^2 .

It is a cyclic number.

It is not a de Polignac number, because 6680066621 - 2⁶ = 6680066557 is a prime.

Together with 6680066623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6680066623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3340033310 + 3340033311.

It is an arithmetic number, because the mean of its divisors is an integer number (3340033311).

Almost surely, 2^6680066621 is an apocalyptic number.

It is an amenable number.

6680066621 is a deficient number, since it is larger than the sum of its proper divisors (1).

6680066621 is an equidigital number, since it uses as much as digits as its factorization.

6680066621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 6680066621 is about 81731.6745270767. The cubic root of 6680066621 is about 1883.3321978291.

The spelling of 6680066621 in words is "six billion, six hundred eighty million, sixty-six thousand, six hundred twenty-one".