12157666 has 16 divisors (see below), whose sum is σ = 18659520. Its totient is φ = 5939280.

The previous prime is 12157657. The next prime is 12157679. The reversal of 12157666 is 66675121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27475 + ... + 27913.

It is an arithmetic number, because the mean of its divisors is an integer number (1166220).

Almost surely, 2^12157666 is an apocalyptic number.

12157666 is a deficient number, since it is larger than the sum of its proper divisors (6501854).

12157666 is a wasteful number, since it uses less digits than its factorization.

12157666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its digits is 15120, while the sum is 34.

The square root of 12157666 is about 3486.7844785705. The cubic root of 12157666 is about 229.9411695785.

The spelling of 12157666 in words is "twelve million, one hundred fifty-seven thousand, six hundred sixty-six".