9640686919 has 2 divisors, whose sum is σ = 9640686920. Its totient is φ = 9640686918.

The previous prime is 9640686889. The next prime is 9640686929. The reversal of 9640686919 is 9196860469.

9640686919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9640686919 - 2¹¹ = 9640684871 is a prime.

It is a super-2 number, since 2×9640686919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9640686929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820343459 + 4820343460.

It is an arithmetic number, because the mean of its divisors is an integer number (4820343460).

Almost surely, 2^9640686919 is an apocalyptic number.

9640686919 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640686919 is an equidigital number, since it uses as much as digits as its factorization.

9640686919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5038848, while the sum is 58.

The square root of 9640686919 is about 98186.9997453838. Note that the first 3 decimals coincide. The cubic root of 9640686919 is about 2128.3154275930.

The spelling of 9640686919 in words is "nine billion, six hundred forty million, six hundred eighty-six thousand, nine hundred nineteen".