1216806683904 has 108 divisors (see below), whose sum is σ = 4009547077536. Its totient is φ = 347659047936.

The previous prime is 1216806683899. The next prime is 1216806683927. The reversal of 1216806683904 is 4093866086121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37707294 + ... + 37739549.

Almost surely, 2^{1216806683904} is an apocalyptic number.

1216806683904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1216806683904 is an abundant number, since it is smaller than the sum of its proper divisors (2792740393632).

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

1216806683904 is an equidigital number, since it uses as much as digits as its factorization.

1216806683904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75446872 (or 75446855 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 1216806683904 in words is "one trillion, two hundred sixteen billion, eight hundred six million, six hundred eighty-three thousand, nine hundred four".