9664895641 has 4 divisors (see below), whose sum is σ = 10233418932. Its totient is φ = 9096372352.

The previous prime is 9664895633. The next prime is 9664895767. The reversal of 9664895641 is 1465984669.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8778940416 + 885955225 = 93696^2 + 29765^2 .

It is a cyclic number.

It is not a de Polignac number, because 9664895641 - 2³ = 9664895633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9664895341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284261620 + ... + 284261653.

It is an arithmetic number, because the mean of its divisors is an integer number (2558354733).

Almost surely, 2^9664895641 is an apocalyptic number.

It is an amenable number.

9664895641 is a deficient number, since it is larger than the sum of its proper divisors (568523291).

9664895641 is a wasteful number, since it uses less digits than its factorization.

9664895641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568523290.

The product of its digits is 11197440, while the sum is 58.

The square root of 9664895641 is about 98310.2011034460. The cubic root of 9664895641 is about 2130.0954089673.

The spelling of 9664895641 in words is "nine billion, six hundred sixty-four million, eight hundred ninety-five thousand, six hundred forty-one".