1216241166 has 64 divisors (see below), whose sum is σ = 3038515200. Its totient is φ = 316500480.

The previous prime is 1216241141. The next prime is 1216241177. The reversal of 1216241166 is 6611426121.

1216241166 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5341 + ... + 49608.

It is an arithmetic number, because the mean of its divisors is an integer number (47476800).

Almost surely, 2^1216241166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216241166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1519257600).

1216241166 is an abundant number, since it is smaller than the sum of its proper divisors (1822274034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216241166 is a wasteful number, since it uses less digits than its factorization.

1216241166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55009.

The product of its digits is 3456, while the sum is 30.

The square root of 1216241166 is about 34874.6493315703. The cubic root of 1216241166 is about 1067.4312170780.

Adding to 1216241166 its reverse (6611426121), we get a palindrome (7827667287).

The spelling of 1216241166 in words is "one billion, two hundred sixteen million, two hundred forty-one thousand, one hundred sixty-six".