1216533145535 has 16 divisors (see below), whose sum is σ = 1503036767232. Its totient is φ = 944669510400.

The previous prime is 1216533145507. The next prime is 1216533145547. The reversal of 1216533145535 is 5355413356121.

It is not a de Polignac number, because 1216533145535 - 2⁸ = 1216533145279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15021311 + ... + 15102080.

It is an arithmetic number, because the mean of its divisors is an integer number (93939797952).

Almost surely, 2^{1216533145535} is an apocalyptic number.

1216533145535 is a deficient number, since it is larger than the sum of its proper divisors (286503621697).

1216533145535 is a wasteful number, since it uses less digits than its factorization.

1216533145535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30123634.

The product of its digits is 810000, while the sum is 44.

The spelling of 1216533145535 in words is "one trillion, two hundred sixteen billion, five hundred thirty-three million, one hundred forty-five thousand, five hundred thirty-five".