1216661306145 has 16 divisors (see below), whose sum is σ = 1951092401280. Its totient is φ = 647407926144.

The previous prime is 1216661306059. The next prime is 1216661306167. The reversal of 1216661306145 is 5416031666121.

It is not a de Polignac number, because 1216661306145 - 2⁹ = 1216661305633 is a prime.

It is a super-2 number, since 2×1216661306145² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1216661306097 and 1216661306106.

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 15 ways as a sum of consecutive naturals, for example, 92374684 + ... + 92387853.

It is an arithmetic number, because the mean of its divisors is an integer number (121943275080).

Almost surely, 2^{1216661306145} is an apocalyptic number.

1216661306145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216661306145 is a deficient number, since it is larger than the sum of its proper divisors (734431095135).

1216661306145 is a wasteful number, since it uses less digits than its factorization.

1216661306145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184762984.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 1216661306145 in words is "one trillion, two hundred sixteen billion, six hundred sixty-one million, three hundred six thousand, one hundred forty-five".