1216166111 has 8 divisors (see below), whose sum is σ = 1306926000. Its totient is φ = 1127541888.

The previous prime is 1216166093. The next prime is 1216166123. The reversal of 1216166111 is 1116616121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216166111 - 2⁶ = 1216166047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216168111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532736 + ... + 535013.

It is an arithmetic number, because the mean of its divisors is an integer number (163365750).

Almost surely, 2^1216166111 is an apocalyptic number.

1216166111 is a deficient number, since it is larger than the sum of its proper divisors (90759889).

1216166111 is a wasteful number, since it uses less digits than its factorization.

1216166111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067833.

The product of its digits is 432, while the sum is 26.

The square root of 1216166111 is about 34873.5732468011. The cubic root of 1216166111 is about 1067.4092593445.

The spelling of 1216166111 in words is "one billion, two hundred sixteen million, one hundred sixty-six thousand, one hundred eleven".