12161666 has 32 divisors (see below), whose sum is σ = 20744640. Its totient is φ = 5299200.

The previous prime is 12161663. The next prime is 12161683. The reversal of 12161666 is 66616121.

It is a super-2 number, since 2×12161666² = 295812239791112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12161663) 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, 87425 + ... + 87563.

It is an arithmetic number, because the mean of its divisors is an integer number (648270).

Almost surely, 2^12161666 is an apocalyptic number.

12161666 is a deficient number, since it is larger than the sum of its proper divisors (8582974).

12161666 is a wasteful number, since it uses less digits than its factorization.

12161666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290.

The product of its digits is 2592, while the sum is 29.

The square root of 12161666 is about 3487.3580257840. The cubic root of 12161666 is about 229.9663845012.

Adding to 12161666 its reverse (66616121), we get a palindrome (78777787).

It can be divided in two parts, 1216 and 1666, that added together give a palindrome (2882).

The spelling of 12161666 in words is "twelve million, one hundred sixty-one thousand, six hundred sixty-six".