11211445165 has 4 divisors (see below), whose sum is σ = 13453734204. Its totient is φ = 8969156128.

The previous prime is 11211445123. The next prime is 11211445171. The reversal of 11211445165 is 56154411211.

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 2558538724 + 8652906441 = 50582^2 + 93021^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211445165 - 2²¹ = 11209348013 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 3 ways as a sum of consecutive naturals, for example, 1121144512 + ... + 1121144521.

It is an arithmetic number, because the mean of its divisors is an integer number (3363433551).

Almost surely, 2^11211445165 is an apocalyptic number.

It is an amenable number.

11211445165 is a deficient number, since it is larger than the sum of its proper divisors (2242289039).

11211445165 is an equidigital number, since it uses as much as digits as its factorization.

11211445165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242289038.

The product of its digits is 4800, while the sum is 31.

Adding to 11211445165 its reverse (56154411211), we get a palindrome (67365856376).

The spelling of 11211445165 in words is "eleven billion, two hundred eleven million, four hundred forty-five thousand, one hundred sixty-five".