1216684853472 has 96 divisors (see below), whose sum is σ = 3558273836544. Its totient is φ = 360847846400.

The previous prime is 1216684853453. The next prime is 1216684853513. The reversal of 1216684853472 is 2743584866121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1216684853472² (a number of 25 digits) contains 22 as substring.

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, 12207429 + ... + 12306692.

It is an arithmetic number, because the mean of its divisors is an integer number (37065352464).

Almost surely, 2^{1216684853472} is an apocalyptic number.

1216684853472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1216684853472 is an abundant number, since it is smaller than the sum of its proper divisors (2341588983072).

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

1216684853472 is a wasteful number, since it uses less digits than its factorization.

1216684853472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24514192 (or 24514184 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 57.

The spelling of 1216684853472 in words is "one trillion, two hundred sixteen billion, six hundred eighty-four million, eight hundred fifty-three thousand, four hundred seventy-two".