6721668370207 has 24 divisors (see below), whose sum is σ = 8185019050880. Its totient is φ = 5406139601280.

The previous prime is 6721668370199. The next prime is 6721668370259. The reversal of 6721668370207 is 7020738661276.

It is not a de Polignac number, because 6721668370207 - 2³ = 6721668370199 is a prime.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721668370007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4349457 + ... + 5688682.

Almost surely, 2^{6721668370207} is an apocalyptic number.

6721668370207 is a deficient number, since it is larger than the sum of its proper divisors (1463350680673).

6721668370207 is a wasteful number, since it uses less digits than its factorization.

6721668370207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10038511 (or 10038494 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 55.

The spelling of 6721668370207 in words is "six trillion, seven hundred twenty-one billion, six hundred sixty-eight million, three hundred seventy thousand, two hundred seven".