1326220165 has 12 divisors (see below), whose sum is σ = 1602211212. Its totient is φ = 1053859200.

The previous prime is 1326220157. The next prime is 1326220169. The reversal of 1326220165 is 5610226231.

It can be written as a sum of positive squares in 2 ways, for example, as 690323076 + 635897089 = 26274^2 + 25217^2 .

It is not a de Polignac number, because 1326220165 - 2³ = 1326220157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326220169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108189 + ... + 119821.

It is an arithmetic number, because the mean of its divisors is an integer number (133517601).

Almost surely, 2^1326220165 is an apocalyptic number.

It is an amenable number.

1326220165 is a deficient number, since it is larger than the sum of its proper divisors (275991047).

1326220165 is an equidigital number, since it uses as much as digits as its factorization.

1326220165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11940 (or 11789 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1326220165 is about 36417.3058448864. The cubic root of 1326220165 is about 1098.6816616635.

Adding to 1326220165 its reverse (5610226231), we get a palindrome (6936446396).

The spelling of 1326220165 in words is "one billion, three hundred twenty-six million, two hundred twenty thousand, one hundred sixty-five".