1216812278784 has 88 divisors (see below), whose sum is σ = 3355084748160. Its totient is φ = 391617716224.

The previous prime is 1216812278779. The next prime is 1216812278809. The reversal of 1216812278784 is 4878722186121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6740184 + ... + 6918359.

Almost surely, 2^{1216812278784} is an apocalyptic number.

It is an amenable number.

1216812278784 is an abundant number, since it is smaller than the sum of its proper divisors (2138272469376).

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

1216812278784 is a wasteful number, since it uses less digits than its factorization.

1216812278784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13658595 (or 13658577 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 57.

The spelling of 1216812278784 in words is "one trillion, two hundred sixteen billion, eight hundred twelve million, two hundred seventy-eight thousand, seven hundred eighty-four".