1216983559520 has 24 divisors (see below), whose sum is σ = 2875123659744. Its totient is φ = 486793423744.

The previous prime is 1216983559489. The next prime is 1216983559559. The reversal of 1216983559520 is 259553896121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3803073464 + ... + 3803073783.

It is an arithmetic number, because the mean of its divisors is an integer number (119796819156).

Almost surely, 2^{1216983559520} is an apocalyptic number.

1216983559520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216983559520 is an abundant number, since it is smaller than the sum of its proper divisors (1658140100224).

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

1216983559520 is an equidigital number, since it uses as much as digits as its factorization.

1216983559520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7606147262 (or 7606147254 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 56.

The spelling of 1216983559520 in words is "one trillion, two hundred sixteen billion, nine hundred eighty-three million, five hundred fifty-nine thousand, five hundred twenty".