1166551616550 has 96 divisors (see below), whose sum is σ = 2923178618880. Its totient is φ = 307844812800.

The previous prime is 1166551616513. The next prime is 1166551616551. The reversal of 1166551616550 is 556161556611.

It is a self number, because there is not a number n which added to its sum of digits gives 1166551616550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166551616551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22701286 + ... + 22752614.

It is an arithmetic number, because the mean of its divisors is an integer number (30449777280).

Almost surely, 2^{1166551616550} is an apocalyptic number.

1166551616550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1166551616550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1461589309440).

1166551616550 is an abundant number, since it is smaller than the sum of its proper divisors (1756627002330).

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

1166551616550 is a wasteful number, since it uses less digits than its factorization.

1166551616550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52918 (or 52913 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 1166551616550 in words is "one trillion, one hundred sixty-six billion, five hundred fifty-one million, six hundred sixteen thousand, five hundred fifty".