1222165565 has 16 divisors (see below), whose sum is σ = 1516202688. Its totient is φ = 945133056.

The previous prime is 1222165523. The next prime is 1222165583. The reversal of 1222165565 is 5655612221.

It is a cyclic number.

It is not a de Polignac number, because 1222165565 - 2¹² = 1222161469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8447 + ... + 50156.

It is an arithmetic number, because the mean of its divisors is an integer number (94762668).

Almost surely, 2^1222165565 is an apocalyptic number.

It is an amenable number.

1222165565 is a deficient number, since it is larger than the sum of its proper divisors (294037123).

1222165565 is an equidigital number, since it uses as much as digits as its factorization.

1222165565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58748.

The product of its digits is 36000, while the sum is 35.

The square root of 1222165565 is about 34959.4846214872. The cubic root of 1222165565 is about 1069.1615888356.

Adding to 1222165565 its reverse (5655612221), we get a palindrome (6877777786).

The spelling of 1222165565 in words is "one billion, two hundred twenty-two million, one hundred sixty-five thousand, five hundred sixty-five".