1216069555920 has 80 divisors (see below), whose sum is σ = 3770028375360. Its totient is φ = 324266913792.

The previous prime is 1216069555919. The next prime is 1216069555957. The reversal of 1216069555920 is 295559606121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4421472 + ... + 4688448.

It is an arithmetic number, because the mean of its divisors is an integer number (47125354692).

Almost surely, 2^{1216069555920} is an apocalyptic number.

1216069555920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216069555920 is an abundant number, since it is smaller than the sum of its proper divisors (2553958819440).

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

1216069555920 is a wasteful number, since it uses less digits than its factorization.

1216069555920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285972 (or 285966 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 51.

The spelling of 1216069555920 in words is "one trillion, two hundred sixteen billion, sixty-nine million, five hundred fifty-five thousand, nine hundred twenty".