1216232566 has 8 divisors (see below), whose sum is σ = 1887257520. Its totient is φ = 587146728.

The previous prime is 1216232533. The next prime is 1216232621. The reversal of 1216232566 is 6652326121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10484706 + ... + 10484821.

It is an arithmetic number, because the mean of its divisors is an integer number (235907190).

Almost surely, 2^1216232566 is an apocalyptic number.

1216232566 is a deficient number, since it is larger than the sum of its proper divisors (671024954).

1216232566 is a wasteful number, since it uses less digits than its factorization.

1216232566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20969558.

The product of its digits is 25920, while the sum is 34.

The square root of 1216232566 is about 34874.5260326216. The cubic root of 1216232566 is about 1067.4287011488.

Adding to 1216232566 its reverse (6652326121), we get a palindrome (7868558687).

The spelling of 1216232566 in words is "one billion, two hundred sixteen million, two hundred thirty-two thousand, five hundred sixty-six".