9666699 has 24 divisors (see below), whose sum is σ = 15252480. Its totient is φ = 5334480.

The previous prime is 9666689. The next prime is 9666707. The reversal of 9666699 is 9966669.

It is not a de Polignac number, because 9666699 - 2⁷ = 9666571 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19942 + ... + 20420.

It is an arithmetic number, because the mean of its divisors is an integer number (635520).

Almost surely, 2^9666699 is an apocalyptic number.

9666699 is a deficient number, since it is larger than the sum of its proper divisors (5585781).

9666699 is a wasteful number, since it uses less digits than its factorization.

9666699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 520 counting only the distinct ones).

The product of its digits is 944784, while the sum is 51.

The square root of 9666699 is about 3109.1315507711. The cubic root of 9666699 is about 213.0227884543.

It can be divided in two parts, 96 and 66699, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 9666699 in words is "nine million, six hundred sixty-six thousand, six hundred ninety-nine".