1166863609 has 16 divisors (see below), whose sum is σ = 1215998784. Its totient is φ = 1118880000.

The previous prime is 1166863601. The next prime is 1166863637. The reversal of 1166863609 is 9063686611.

It is a cyclic number.

It is not a de Polignac number, because 1166863609 - 2³ = 1166863601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166863601) 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 15 ways as a sum of consecutive naturals, for example, 787149 + ... + 788629.

It is an arithmetic number, because the mean of its divisors is an integer number (75999924).

Almost surely, 2^1166863609 is an apocalyptic number.

It is an amenable number.

1166863609 is a deficient number, since it is larger than the sum of its proper divisors (49135175).

1166863609 is a wasteful number, since it uses less digits than its factorization.

1166863609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 1166863609 is about 34159.3853721053. The cubic root of 1166863609 is about 1052.7858324002.

It can be divided in two parts, 116686 and 3609, that added together give a triangular number (120295 = T₄₉₀).

The spelling of 1166863609 in words is "one billion, one hundred sixty-six million, eight hundred sixty-three thousand, six hundred nine".