9663966421 has 8 divisors (see below), whose sum is σ = 10256863680. Its totient is φ = 9073783488.

The previous prime is 9663966391. The next prime is 9663966439. The reversal of 9663966421 is 1246693669.

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 9663966421 - 2³¹ = 7516482773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9663966491) 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, 671241 + ... + 685486.

It is an arithmetic number, because the mean of its divisors is an integer number (1282107960).

Almost surely, 2^9663966421 is an apocalyptic number.

It is an amenable number.

9663966421 is a deficient number, since it is larger than the sum of its proper divisors (592897259).

9663966421 is a wasteful number, since it uses less digits than its factorization.

9663966421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357163.

The product of its digits is 2519424, while the sum is 52.

The square root of 9663966421 is about 98305.4750306411. The cubic root of 9663966421 is about 2130.0271416086.

The spelling of 9663966421 in words is "nine billion, six hundred sixty-three million, nine hundred sixty-six thousand, four hundred twenty-one".