1216085242275 has 72 divisors (see below), whose sum is σ = 2208038676480. Its totient is φ = 639703005120.

The previous prime is 1216085242247. The next prime is 1216085242291. The reversal of 1216085242275 is 5722425806121.

1216085242275 is a `hidden beast` number, since 1 + 2 + 1 + 60 + 85 + 242 + 275 = 666.

It is not a de Polignac number, because 1216085242275 - 2¹⁰ = 1216085241251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1216085242275.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11282086 + ... + 11389364.

It is an arithmetic number, because the mean of its divisors is an integer number (30667203840).

Almost surely, 2^{1216085242275} is an apocalyptic number.

1216085242275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216085242275 is a deficient number, since it is larger than the sum of its proper divisors (991953434205).

1216085242275 is a wasteful number, since it uses less digits than its factorization.

1216085242275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107985 (or 107977 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 1216085242275 in words is "one trillion, two hundred sixteen billion, eighty-five million, two hundred forty-two thousand, two hundred seventy-five".