9657666 has 48 divisors (see below), whose sum is σ = 22781304. Its totient is φ = 2944512.

The previous prime is 9657653. The next prime is 9657679. The reversal of 9657666 is 6667569.

It is an interprime number because it is at equal distance from previous prime (9657653) and next prime (9657679).

It can be written as a sum of positive squares in 4 ways, for example, as 8874441 + 783225 = 2979^2 + 885^2 .

It is a Curzon number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 10896 + ... + 11748.

Almost surely, 2^9657666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9657666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11390652).

9657666 is an abundant number, since it is smaller than the sum of its proper divisors (13123638).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9657666 is a wasteful number, since it uses less digits than its factorization.

9657666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 912 counting only the distinct ones).

The product of its digits is 408240, while the sum is 45.

The square root of 9657666 is about 3107.6785548058. The cubic root of 9657666 is about 212.9564150720.

The spelling of 9657666 in words is "nine million, six hundred fifty-seven thousand, six hundred sixty-six".