1222165563 has 4 divisors (see below), whose sum is σ = 1629554088. Its totient is φ = 814777040.

The previous prime is 1222165523. The next prime is 1222165583. The reversal of 1222165563 is 3655612221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1222165563 - 2²⁶ = 1155056699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1222165523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203694258 + ... + 203694263.

It is an arithmetic number, because the mean of its divisors is an integer number (407388522).

Almost surely, 2^1222165563 is an apocalyptic number.

1222165563 is a deficient number, since it is larger than the sum of its proper divisors (407388525).

1222165563 is an equidigital number, since it uses as much as digits as its factorization.

1222165563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407388524.

The product of its digits is 21600, while the sum is 33.

The square root of 1222165563 is about 34959.4845928827. The cubic root of 1222165563 is about 1069.1615882524.

Adding to 1222165563 its reverse (3655612221), we get a palindrome (4877777784).

The spelling of 1222165563 in words is "one billion, two hundred twenty-two million, one hundred sixty-five thousand, five hundred sixty-three".