1166985885 has 16 divisors (see below), whose sum is σ = 2010806784. Its totient is φ = 574516032.

The previous prime is 1166985881. The next prime is 1166985907. The reversal of 1166985885 is 5885896611.

It is a happy number.

It is not a de Polignac number, because 1166985885 - 2² = 1166985881 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166985881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2992077 + ... + 2992466.

It is an arithmetic number, because the mean of its divisors is an integer number (125675424).

Almost surely, 2^1166985885 is an apocalyptic number.

1166985885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166985885 is a deficient number, since it is larger than the sum of its proper divisors (843820899).

1166985885 is a wasteful number, since it uses less digits than its factorization.

1166985885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5984564.

The product of its digits is 4147200, while the sum is 57.

The square root of 1166985885 is about 34161.1751115210. The cubic root of 1166985885 is about 1052.8226050339.

The spelling of 1166985885 in words is "one billion, one hundred sixty-six million, nine hundred eighty-five thousand, eight hundred eighty-five".