9656661 has 8 divisors (see below), whose sum is σ = 14714944. Its totient is φ = 5518080.

The previous prime is 9656651. The next prime is 9656671. The reversal of 9656661 is 1666569.

9656661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9656651) and next prime (9656671).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9656661 - 2¹⁵ = 9623893 is a prime.

It is a super-2 number, since 2×9656661² = 186502203337842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

9656661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9656611) 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, 229900 + ... + 229941.

It is an arithmetic number, because the mean of its divisors is an integer number (1839368).

Almost surely, 2^9656661 is an apocalyptic number.

It is an amenable number.

9656661 is a deficient number, since it is larger than the sum of its proper divisors (5058283).

9656661 is a wasteful number, since it uses less digits than its factorization.

9656661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459851.

The product of its digits is 58320, while the sum is 39.

The square root of 9656661 is about 3107.5168543388. The cubic root of 9656661 is about 212.9490278965.

It can be divided in two parts, 965 and 6661, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 9656661 in words is "nine million, six hundred fifty-six thousand, six hundred sixty-one".