13165666 has 16 divisors (see below), whose sum is σ = 20217600. Its totient is φ = 6428448.

The previous prime is 13165661. The next prime is 13165679. The reversal of 13165666 is 66656131.

It is a super-2 number, since 2×13165666² = 346669522447112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13165661) 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, 15870 + ... + 16678.

It is an arithmetic number, because the mean of its divisors is an integer number (1263600).

Almost surely, 2^13165666 is an apocalyptic number.

13165666 is a deficient number, since it is larger than the sum of its proper divisors (7051934).

13165666 is a wasteful number, since it uses less digits than its factorization.

13165666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993.

The product of its digits is 19440, while the sum is 34.

The square root of 13165666 is about 3628.4522871329. The cubic root of 13165666 is about 236.1280665635.

It can be divided in two parts, 13165 and 666, that added together give a palindrome (13831).

The spelling of 13165666 in words is "thirteen million, one hundred sixty-five thousand, six hundred sixty-six".