11225213665 has 4 divisors (see below), whose sum is σ = 13470256404. Its totient is φ = 8980170928.

The previous prime is 11225213633. The next prime is 11225213669. The reversal of 11225213665 is 56631252211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4832891361 + 6392322304 = 69519^2 + 79952^2 .

It is a cyclic number.

It is not a de Polignac number, because 11225213665 - 2⁵ = 11225213633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11225213665.

It is not an unprimeable number, because it can be changed into a prime (11225213669) 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, 1122521362 + ... + 1122521371.

It is an arithmetic number, because the mean of its divisors is an integer number (3367564101).

Almost surely, 2^11225213665 is an apocalyptic number.

It is an amenable number.

11225213665 is a deficient number, since it is larger than the sum of its proper divisors (2245042739).

11225213665 is an equidigital number, since it uses as much as digits as its factorization.

11225213665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245042738.

The product of its digits is 21600, while the sum is 34.

Adding to 11225213665 its reverse (56631252211), we get a palindrome (67856465876).

The spelling of 11225213665 in words is "eleven billion, two hundred twenty-five million, two hundred thirteen thousand, six hundred sixty-five".