1216331851575 has 24 divisors (see below), whose sum is σ = 2024319907456. Its totient is φ = 644414220000.

The previous prime is 1216331851529. The next prime is 1216331851597. The reversal of 1216331851575 is 5751581336121.

It is not a de Polignac number, because 1216331851575 - 2¹⁶ = 1216331786039 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 23 ways as a sum of consecutive naturals, for example, 53689861 + ... + 53712510.

Almost surely, 2^{1216331851575} is an apocalyptic number.

1216331851575 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216331851575 is a deficient number, since it is larger than the sum of its proper divisors (807988055881).

1216331851575 is a wasteful number, since it uses less digits than its factorization.

1216331851575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107402535 (or 107402530 counting only the distinct ones).

The product of its digits is 756000, while the sum is 48.

The spelling of 1216331851575 in words is "one trillion, two hundred sixteen billion, three hundred thirty-one million, eight hundred fifty-one thousand, five hundred seventy-five".