22166506 has 4 divisors (see below), whose sum is σ = 33249762. Its totient is φ = 11083252.

The previous prime is 22166497. The next prime is 22166509. The reversal of 22166506 is 60566122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60566122 = 2 ⋅30283061.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 1418481 = 4555^2 + 1191^2 .

It is not an unprimeable number, because it can be changed into a prime (22166509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5541625 + ... + 5541628.

Almost surely, 2^22166506 is an apocalyptic number.

22166506 is a deficient number, since it is larger than the sum of its proper divisors (11083256).

22166506 is a wasteful number, since it uses less digits than its factorization.

22166506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11083255.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 22166506 is about 4708.1319012959. The cubic root of 22166506 is about 280.9090607143.

The spelling of 22166506 in words is "twenty-two million, one hundred sixty-six thousand, five hundred six".