22151666 has 4 divisors (see below), whose sum is σ = 33227502. Its totient is φ = 11075832.

The previous prime is 22151653. The next prime is 22151669. The reversal of 22151666 is 66615122.

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., 22137025 + 14641 = 4705^2 + 121^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22151669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5537915 + ... + 5537918.

Almost surely, 2^22151666 is an apocalyptic number.

22151666 is a deficient number, since it is larger than the sum of its proper divisors (11075836).

22151666 is a wasteful number, since it uses less digits than its factorization.

22151666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11075835.

The product of its digits is 4320, while the sum is 29.

The square root of 22151666 is about 4706.5556408057. Note that the first 3 decimals coincide. The cubic root of 22151666 is about 280.8463591908.

Adding to 22151666 its reverse (66615122), we get a palindrome (88766788).

The spelling of 22151666 in words is "twenty-two million, one hundred fifty-one thousand, six hundred sixty-six".