12666145 has 8 divisors (see below), whose sum is σ = 15246504. Its totient is φ = 10101504.

The previous prime is 12666133. The next prime is 12666167. The reversal of 12666145 is 54166621.

It can be written as a sum of positive squares in 4 ways, for example, as 2572816 + 10093329 = 1604^2 + 3177^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12666145 - 2²¹ = 10568993 is a prime.

It is a super-2 number, since 2×12666145² = 320862458322050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2074 + ... + 5443.

It is an arithmetic number, because the mean of its divisors is an integer number (1905813).

Almost surely, 2^12666145 is an apocalyptic number.

It is an amenable number.

12666145 is a deficient number, since it is larger than the sum of its proper divisors (2580359).

12666145 is an equidigital number, since it uses as much as digits as its factorization.

12666145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7859.

The product of its digits is 8640, while the sum is 31.

The square root of 12666145 is about 3558.9527954161. The cubic root of 12666145 is about 233.1031550950.

The spelling of 12666145 in words is "twelve million, six hundred sixty-six thousand, one hundred forty-five".