1166505616556 has 12 divisors (see below), whose sum is σ = 2333011233168. Its totient is φ = 499930978512.

The previous prime is 1166505616501. The next prime is 1166505616589. The reversal of 1166505616556 is 6556165056611.

1166505616556 is an admirable number.

It is a super-2 number, since 2×1166505616556² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1166505616498 and 1166505616507.

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 3 ways as a sum of consecutive naturals, for example, 20830457411 + ... + 20830457466.

It is an arithmetic number, because the mean of its divisors is an integer number (194417602764).

Almost surely, 2^{1166505616556} is an apocalyptic number.

It is an amenable number.

1166505616556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1166505616556 is a wasteful number, since it uses less digits than its factorization.

1166505616556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41660914888 (or 41660914886 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 53.

The spelling of 1166505616556 in words is "one trillion, one hundred sixty-six billion, five hundred five million, six hundred sixteen thousand, five hundred fifty-six".