9640921645207 has 2 divisors, whose sum is σ = 9640921645208. Its totient is φ = 9640921645206.

The previous prime is 9640921645151. The next prime is 9640921645213. The reversal of 9640921645207 is 7025461290469.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9640921645207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9640921645007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820460822603 + 4820460822604.

It is an arithmetic number, because the mean of its divisors is an integer number (4820460822604).

Almost surely, 2^{9640921645207} is an apocalyptic number.

9640921645207 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640921645207 is an equidigital number, since it uses as much as digits as its factorization.

9640921645207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 9640921645207 in words is "nine trillion, six hundred forty billion, nine hundred twenty-one million, six hundred forty-five thousand, two hundred seven".