12666155 has 4 divisors (see below), whose sum is σ = 15199392. Its totient is φ = 10132920.

The previous prime is 12666133. The next prime is 12666167. The reversal of 12666155 is 55166621.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12666155 - 2¹⁰ = 12665131 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266611 + ... + 1266620.

It is an arithmetic number, because the mean of its divisors is an integer number (3799848).

Almost surely, 2^12666155 is an apocalyptic number.

12666155 is a deficient number, since it is larger than the sum of its proper divisors (2533237).

12666155 is an equidigital number, since it uses as much as digits as its factorization.

12666155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2533236.

The product of its digits is 10800, while the sum is 32.

The square root of 12666155 is about 3558.9542003235. The cubic root of 12666155 is about 233.1032164405.

It can be divided in two parts, 12666 and 155, that added together give a palindrome (12821).

The spelling of 12666155 in words is "twelve million, six hundred sixty-six thousand, one hundred fifty-five".