9666555 has 16 divisors (see below), whose sum is σ = 16139520. Its totient is φ = 4931168.

The previous prime is 9666551. The next prime is 9666563. The reversal of 9666555 is 5556669.

It is a cyclic number.

It is not a de Polignac number, because 9666555 - 2² = 9666551 is a prime.

It is a nialpdrome in base 10.

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 15 ways as a sum of consecutive naturals, for example, 13665 + ... + 14354.

It is an arithmetic number, because the mean of its divisors is an integer number (1008720).

Almost surely, 2^9666555 is an apocalyptic number.

9666555 is a deficient number, since it is larger than the sum of its proper divisors (6472965).

9666555 is a wasteful number, since it uses less digits than its factorization.

9666555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28050.

The product of its digits is 243000, while the sum is 42.

The square root of 9666555 is about 3109.1083930928. The cubic root of 9666555 is about 213.0217306842.

It can be divided in two parts, 9 and 666555, that multiplied together give a palindrome (5998995).

The spelling of 9666555 in words is "nine million, six hundred sixty-six thousand, five hundred fifty-five".