9966881 has 4 divisors (see below), whose sum is σ = 9995952. Its totient is φ = 9937812.

The previous prime is 9966871. The next prime is 9966883. The reversal of 9966881 is 1886699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9966881 is a prime.

It is a super-2 number, since 2×9966881² = 198677433736322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9966883) 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, 14015 + ... + 14708.

It is an arithmetic number, because the mean of its divisors is an integer number (2498988).

Almost surely, 2^9966881 is an apocalyptic number.

It is an amenable number.

9966881 is a deficient number, since it is larger than the sum of its proper divisors (29071).

9966881 is a wasteful number, since it uses less digits than its factorization.

9966881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29070.

The product of its digits is 186624, while the sum is 47.

The square root of 9966881 is about 3157.0367435302. The cubic root of 9966881 is about 215.2053635406.

The spelling of 9966881 in words is "nine million, nine hundred sixty-six thousand, eight hundred eighty-one".