9666557 has 8 divisors (see below), whose sum is σ = 10351800. Its totient is φ = 8994304.

The previous prime is 9666551. The next prime is 9666563. The reversal of 9666557 is 7556669.

It is an interprime number because it is at equal distance from previous prime (9666551) and next prime (9666563).

It can be written as a sum of positive squares in 4 ways, for example, as 676 + 9665881 = 26^2 + 3109^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9666557 - 2⁸ = 9666301 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666551) 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, 1682 + ... + 4707.

It is an arithmetic number, because the mean of its divisors is an integer number (1293975).

Almost surely, 2^9666557 is an apocalyptic number.

It is an amenable number.

9666557 is a deficient number, since it is larger than the sum of its proper divisors (685243).

9666557 is a wasteful number, since it uses less digits than its factorization.

9666557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495.

The product of its digits is 340200, while the sum is 44.

The square root of 9666557 is about 3109.1087147284. The cubic root of 9666557 is about 213.0217453756.

The spelling of 9666557 in words is "nine million, six hundred sixty-six thousand, five hundred fifty-seven".