2167666 has 4 divisors (see below), whose sum is σ = 3251502. Its totient is φ = 1083832.

The previous prime is 2167661. The next prime is 2167703. The reversal of 2167666 is 6667612.

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

It can be written as a sum of positive squares in only one way, i.e., 1274641 + 893025 = 1129^2 + 945^2 .

It is not an unprimeable number, because it can be changed into a prime (2167661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541915 + ... + 541918.

2^2167666 is an apocalyptic number.

2167666 is a deficient number, since it is larger than the sum of its proper divisors (1083836).

2167666 is a wasteful number, since it uses less digits than its factorization.

2167666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083835.

The product of its digits is 18144, while the sum is 34.

The square root of 2167666 is about 1472.2995619099. The cubic root of 2167666 is about 129.4188258098.

The spelling of 2167666 in words is "two million, one hundred sixty-seven thousand, six hundred sixty-six".