9966779 has 4 divisors (see below), whose sum is σ = 10288320. Its totient is φ = 9645240.

The previous prime is 9966769. The next prime is 9966791. The reversal of 9966779 is 9776699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9776699 = 101 ⋅96799.

It is a cyclic number.

It is not a de Polignac number, because 9966779 - 2¹² = 9962683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9966779.

It is not an unprimeable number, because it can be changed into a prime (9966769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160724 + ... + 160785.

It is an arithmetic number, because the mean of its divisors is an integer number (2572080).

Almost surely, 2^9966779 is an apocalyptic number.

9966779 is a deficient number, since it is larger than the sum of its proper divisors (321541).

9966779 is a wasteful number, since it uses less digits than its factorization.

9966779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321540.

The product of its digits is 1285956, while the sum is 53.

The square root of 9966779 is about 3157.0205890998. The cubic root of 9966779 is about 215.2046294085.

The spelling of 9966779 in words is "nine million, nine hundred sixty-six thousand, seven hundred seventy-nine".