1166576881 has 4 divisors (see below), whose sum is σ = 1206803700. Its totient is φ = 1126350064.

The previous prime is 1166576849. The next prime is 1166576891. The reversal of 1166576881 is 1886756611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 354041856 + 812535025 = 18816^2 + 28505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166576881 - 2⁵ = 1166576849 is a prime.

It is a super-2 number, since 2×1166576881² = 2721803238567376322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166576891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20113366 + ... + 20113423.

It is an arithmetic number, because the mean of its divisors is an integer number (301700925).

Almost surely, 2^1166576881 is an apocalyptic number.

It is an amenable number.

1166576881 is a deficient number, since it is larger than the sum of its proper divisors (40226819).

1166576881 is an equidigital number, since it uses as much as digits as its factorization.

1166576881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40226818.

The product of its digits is 483840, while the sum is 49.

The square root of 1166576881 is about 34155.1882003306. The cubic root of 1166576881 is about 1052.6995932710.

The spelling of 1166576881 in words is "one billion, one hundred sixty-six million, five hundred seventy-six thousand, eight hundred eighty-one".