12166557 has 8 divisors (see below), whose sum is σ = 17469984. Its totient is φ = 7487088.

The previous prime is 12166547. The next prime is 12166579. The reversal of 12166557 is 75566121.

12166557 is nontrivially palindromic in base 2.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12166557 - 2⁶ = 12166493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12166537) 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, 155943 + ... + 156020.

It is an arithmetic number, because the mean of its divisors is an integer number (2183748).

Almost surely, 2^12166557 is an apocalyptic number.

It is an amenable number.

12166557 is a deficient number, since it is larger than the sum of its proper divisors (5303427).

12166557 is a wasteful number, since it uses less digits than its factorization.

12166557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311979.

The product of its digits is 12600, while the sum is 33.

The square root of 12166557 is about 3488.0592024792. The cubic root of 12166557 is about 229.9972085357.

The spelling of 12166557 in words is "twelve million, one hundred sixty-six thousand, five hundred fifty-seven".