1216166118529 has 4 divisors (see below), whose sum is σ = 1216271162160. Its totient is φ = 1216061074900.

The previous prime is 1216166118511. The next prime is 1216166118569. The reversal of 1216166118529 is 9258116616121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1216166118529 - 2¹¹ = 1216166116481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216166118509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52504447 + ... + 52527604.

It is an arithmetic number, because the mean of its divisors is an integer number (304067790540).

Almost surely, 2^{1216166118529} is an apocalyptic number.

It is an amenable number.

1216166118529 is a deficient number, since it is larger than the sum of its proper divisors (105043631).

1216166118529 is a wasteful number, since it uses less digits than its factorization.

1216166118529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105043630.

The product of its digits is 311040, while the sum is 49.

The spelling of 1216166118529 in words is "one trillion, two hundred sixteen billion, one hundred sixty-six million, one hundred eighteen thousand, five hundred twenty-nine".