22143665 has 8 divisors (see below), whose sum is σ = 27074088. Its totient is φ = 17380480.

The previous prime is 22143637. The next prime is 22143689. The reversal of 22143665 is 56634122.

It can be written as a sum of positive squares in 4 ways, for example, as 1495729 + 20647936 = 1223^2 + 4544^2 .

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

It is not a de Polignac number, because 22143665 - 2¹² = 22139569 is a prime.

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, 41516 + ... + 42045.

It is an arithmetic number, because the mean of its divisors is an integer number (3384261).

Almost surely, 2^22143665 is an apocalyptic number.

It is an amenable number.

22143665 is a deficient number, since it is larger than the sum of its proper divisors (4930423).

22143665 is an equidigital number, since it uses as much as digits as its factorization.

22143665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83619.

The product of its digits is 8640, while the sum is 29.

The square root of 22143665 is about 4705.7055794004. The cubic root of 22143665 is about 280.8125419855.

Adding to 22143665 its reverse (56634122), we get a palindrome (78777787).

The spelling of 22143665 in words is "twenty-two million, one hundred forty-three thousand, six hundred sixty-five".