1216468525266 has 12 divisors (see below), whose sum is σ = 2635681804782. Its totient is φ = 405489508416.

The previous prime is 1216468525249. The next prime is 1216468525291. The reversal of 1216468525266 is 6625258646121.

1216468525266 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 4 + 68 + 52 + 526 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 767602024641 + 448866500625 = 876129^2 + 669975^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33790792351 + ... + 33790792386.

Almost surely, 2^{1216468525266} is an apocalyptic number.

1216468525266 is an abundant number, since it is smaller than the sum of its proper divisors (1419213279516).

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

1216468525266 is a wasteful number, since it uses less digits than its factorization.

1216468525266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67581584745 (or 67581584742 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The spelling of 1216468525266 in words is "one trillion, two hundred sixteen billion, four hundred sixty-eight million, five hundred twenty-five thousand, two hundred sixty-six".