1166784885 has 128 divisors (see below), whose sum is σ = 2554675200. Its totient is φ = 493102080.

The previous prime is 1166784859. The next prime is 1166784901. The reversal of 1166784885 is 5884876611.

It is a happy number.

It is not a de Polignac number, because 1166784885 - 2⁹ = 1166784373 is a prime.

It is a super-2 number, since 2×1166784885² = 2722773935728926450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 947220 + ... + 948450.

It is an arithmetic number, because the mean of its divisors is an integer number (19958400).

Almost surely, 2^1166784885 is an apocalyptic number.

1166784885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166784885 is an abundant number, since it is smaller than the sum of its proper divisors (1387890315).

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

1166784885 is a wasteful number, since it uses less digits than its factorization.

1166784885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1322 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The square root of 1166784885 is about 34158.2330485639. The cubic root of 1166784885 is about 1052.7621560039.

The spelling of 1166784885 in words is "one billion, one hundred sixty-six million, seven hundred eighty-four thousand, eight hundred eighty-five".