9640686841 has 2 divisors, whose sum is σ = 9640686842. Its totient is φ = 9640686840.

The previous prime is 9640686829. The next prime is 9640686851. The reversal of 9640686841 is 1486860469.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9308390400 + 332296441 = 96480^2 + 18229^2 .

It is a cyclic number.

It is not a de Polignac number, because 9640686841 - 2⁹ = 9640686329 is a prime.

It is not a weakly prime, because it can be changed into another prime (9640686851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4820343420 + 4820343421.

It is an arithmetic number, because the mean of its divisors is an integer number (4820343421).

Almost surely, 2^9640686841 is an apocalyptic number.

It is an amenable number.

9640686841 is a deficient number, since it is larger than the sum of its proper divisors (1).

9640686841 is an equidigital number, since it uses as much as digits as its factorization.

9640686841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The square root of 9640686841 is about 98186.9993481825. Note that the first 3 decimals coincide. The cubic root of 9640686841 is about 2128.3154218531.

The spelling of 9640686841 in words is "nine billion, six hundred forty million, six hundred eighty-six thousand, eight hundred forty-one".