1166495661 has 20 divisors (see below), whose sum is σ = 1768559232. Its totient is φ = 766053288.

The previous prime is 1166495653. The next prime is 1166495663. The reversal of 1166495661 is 1665946611.

It is not a de Polignac number, because 1166495661 - 2³ = 1166495653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166495663) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 102045 + ... + 112898.

Almost surely, 2^1166495661 is an apocalyptic number.

It is an amenable number.

1166495661 is a deficient number, since it is larger than the sum of its proper divisors (602063571).

1166495661 is an equidigital number, since it uses as much as digits as its factorization.

1166495661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215022 (or 215013 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 1166495661 is about 34153.9991948234. Note that the first 3 decimals coincide. The cubic root of 1166495661 is about 1052.6751621779.

The spelling of 1166495661 in words is "one billion, one hundred sixty-six million, four hundred ninety-five thousand, six hundred sixty-one".