1216133165 has 64 divisors (see below), whose sum is σ = 1756339200. Its totient is φ = 799248384.

The previous prime is 1216133159. The next prime is 1216133173. The reversal of 1216133165 is 5613316121.

It is a cyclic number.

It is not a de Polignac number, because 1216133165 - 2¹² = 1216129069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2770016 + ... + 2770454.

It is an arithmetic number, because the mean of its divisors is an integer number (27442800).

Almost surely, 2^1216133165 is an apocalyptic number.

It is an amenable number.

1216133165 is a deficient number, since it is larger than the sum of its proper divisors (540206035).

1216133165 is a wasteful number, since it uses less digits than its factorization.

1216133165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606.

The product of its digits is 3240, while the sum is 29.

The square root of 1216133165 is about 34873.1008801913. The cubic root of 1216133165 is about 1067.3996205343.

Adding to 1216133165 its reverse (5613316121), we get a palindrome (6829449286).

The spelling of 1216133165 in words is "one billion, two hundred sixteen million, one hundred thirty-three thousand, one hundred sixty-five".