9129665643 has 20 divisors (see below), whose sum is σ = 14200868328. Its totient is φ = 5216947680.

The previous prime is 9129665641. The next prime is 9129665647. The reversal of 9129665643 is 3465669219.

9129665643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9129665643 - 2¹ = 9129665641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9129665641) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 626538 + ... + 640943.

Almost surely, 2^9129665643 is an apocalyptic number.

9129665643 is a deficient number, since it is larger than the sum of its proper divisors (5071202685).

9129665643 is an equidigital number, since it uses as much as digits as its factorization.

9129665643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267512 (or 1267491 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 51.

The square root of 9129665643 is about 95549.2838434700. The cubic root of 9129665643 is about 2090.0256891907.

The spelling of 9129665643 in words is "nine billion, one hundred twenty-nine million, six hundred sixty-five thousand, six hundred forty-three".