1216024866 has 160 divisors (see below), whose sum is σ = 3218685120. Its totient is φ = 340212096.

The previous prime is 1216024847. The next prime is 1216024891. The reversal of 1216024866 is 6684206121.

1216024866 is a `hidden beast` number, since 1 + 2 + 1 + 602 + 48 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1216024866.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10761226 + ... + 10761338.

It is an arithmetic number, because the mean of its divisors is an integer number (20116782).

Almost surely, 2^1216024866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216024866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609342560).

1216024866 is an abundant number, since it is smaller than the sum of its proper divisors (2002660254).

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

1216024866 is an equidigital number, since it uses as much as digits as its factorization.

1216024866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1216024866 is about 34871.5480872301. The cubic root of 1216024866 is about 1067.3679349299.

The spelling of 1216024866 in words is "one billion, two hundred sixteen million, twenty-four thousand, eight hundred sixty-six".