1216841978880 has 1584 divisors, whose sum is σ = 4923256403520. Its totient is φ = 287875399680.

The previous prime is 1216841978797. The next prime is 1216841978917. The reversal of 1216841978880 is 888791486121.

1216841978880 is a `hidden beast` number, since 1 + 2 + 1 + 68 + 419 + 7 + 88 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (1584).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 8882058172 + ... + 8882058308.

Almost surely, 2^{1216841978880} is an apocalyptic number.

1216841978880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216841978880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2461628201760).

1216841978880 is an abundant number, since it is smaller than the sum of its proper divisors (3706414424640).

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

1216841978880 is a wasteful number, since it uses less digits than its factorization.

1216841978880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 63.

The spelling of 1216841978880 in words is "one trillion, two hundred sixteen billion, eight hundred forty-one million, nine hundred seventy-eight thousand, eight hundred eighty".