9664948921 has 8 divisors (see below), whose sum is σ = 9739571400. Its totient is φ = 9590456832.

The previous prime is 9664948897. The next prime is 9664948939. The reversal of 9664948921 is 1298494669.

It can be written as a sum of positive squares in 4 ways, for example, as 107931321 + 9557017600 = 10389^2 + 97760^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9664948921 - 2⁵ = 9664948889 is a prime.

It is a super-2 number, since 2×9664948921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9664948981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118921 + ... + 182953.

It is an arithmetic number, because the mean of its divisors is an integer number (1217446425).

Almost surely, 2^9664948921 is an apocalyptic number.

It is an amenable number.

9664948921 is a deficient number, since it is larger than the sum of its proper divisors (74622479).

9664948921 is a wasteful number, since it uses less digits than its factorization.

9664948921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65195.

The product of its digits is 6718464, while the sum is 58.

The square root of 9664948921 is about 98310.4720820727. The cubic root of 9664948921 is about 2130.0993231767.

The spelling of 9664948921 in words is "nine billion, six hundred sixty-four million, nine hundred forty-eight thousand, nine hundred twenty-one".