9640921645213 has 2 divisors, whose sum is σ = 9640921645214. Its totient is φ = 9640921645212.

The previous prime is 9640921645207. The next prime is 9640921645219. The reversal of 9640921645213 is 3125461290469.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (9640921645207) and next prime (9640921645219).

It can be written as a sum of positive squares in only one way, i.e., 9008479996569 + 632441648644 = 3001413^2 + 795262^2 .

It is a cyclic number.

It is not a de Polignac number, because 9640921645213 - 2²⁵ = 9640888090781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9640921645219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820460822606 + 4820460822607.

It is an arithmetic number, because the mean of its divisors is an integer number (4820460822607).

Almost surely, 2^{9640921645213} is an apocalyptic number.

It is an amenable number.

9640921645213 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640921645213 is an equidigital number, since it uses as much as digits as its factorization.

9640921645213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 52.

The spelling of 9640921645213 in words is "nine trillion, six hundred forty billion, nine hundred twenty-one million, six hundred forty-five thousand, two hundred thirteen".