1216074665 has 64 divisors (see below), whose sum is σ = 1689569280. Its totient is φ = 833863680.

The previous prime is 1216074659. The next prime is 1216074667. The reversal of 1216074665 is 5664706121.

It is not a de Polignac number, because 1216074665 - 2⁴ = 1216074649 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216074667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6300809 + ... + 6301001.

It is an arithmetic number, because the mean of its divisors is an integer number (26399520).

Almost surely, 2^1216074665 is an apocalyptic number.

It is an amenable number.

1216074665 is a deficient number, since it is larger than the sum of its proper divisors (473494615).

1216074665 is a wasteful number, since it uses less digits than its factorization.

1216074665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1216074665 is about 34872.2621147525. The cubic root of 1216074665 is about 1067.3825051172.

The spelling of 1216074665 in words is "one billion, two hundred sixteen million, seventy-four thousand, six hundred sixty-five".