9640686943 has 2 divisors, whose sum is σ = 9640686944. Its totient is φ = 9640686942.

The previous prime is 9640686929. The next prime is 9640687003. The reversal of 9640686943 is 3496860469.

It is a weak prime.

It is an emirp because it is prime and its reverse (3496860469) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9640686943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9640681943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820343471 + 4820343472.

It is an arithmetic number, because the mean of its divisors is an integer number (4820343472).

Almost surely, 2^9640686943 is an apocalyptic number.

9640686943 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640686943 is an equidigital number, since it uses as much as digits as its factorization.

9640686943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6718464, while the sum is 55.

The square root of 9640686943 is about 98186.9998675996. Note that the first 3 decimals coincide. The cubic root of 9640686943 is about 2128.3154293591.

The spelling of 9640686943 in words is "nine billion, six hundred forty million, six hundred eighty-six thousand, nine hundred forty-three".