1216061110556 has 12 divisors (see below), whose sum is σ = 2147995794168. Its totient is φ = 602348026512.

The previous prime is 1216061110553. The next prime is 1216061110601. The reversal of 1216061110556 is 6550111606121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216061110553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420631711 + ... + 1420632566.

It is an arithmetic number, because the mean of its divisors is an integer number (178999649514).

Almost surely, 2^{1216061110556} is an apocalyptic number.

It is an amenable number.

1216061110556 is a deficient number, since it is larger than the sum of its proper divisors (931934683612).

1216061110556 is a wasteful number, since it uses less digits than its factorization.

1216061110556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2841264388 (or 2841264386 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 35.

Adding to 1216061110556 its reverse (6550111606121), we get a palindrome (7766172716677).

The spelling of 1216061110556 in words is "one trillion, two hundred sixteen billion, sixty-one million, one hundred ten thousand, five hundred fifty-six".