22161666 has 32 divisors (see below), whose sum is σ = 45461376. Its totient is φ = 7200000.

The previous prime is 22161661. The next prime is 22161679. The reversal of 22161666 is 66616122.

It is a super-2 number, since 2×22161666² = 982278879791112, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (22161661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55066 + ... + 55466.

It is an arithmetic number, because the mean of its divisors is an integer number (1420668).

Almost surely, 2^22161666 is an apocalyptic number.

22161666 is an abundant number, since it is smaller than the sum of its proper divisors (23299710).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22161666 is a wasteful number, since it uses less digits than its factorization.

22161666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618.

The product of its digits is 5184, while the sum is 30.

The square root of 22161666 is about 4707.6178689439. The cubic root of 22161666 is about 280.8886139673. Note that the first 3 decimals are identical.

Adding to 22161666 its reverse (66616122), we get a palindrome (88777788).

The spelling of 22161666 in words is "twenty-two million, one hundred sixty-one thousand, six hundred sixty-six".