1166663559 has 4 divisors (see below), whose sum is σ = 1555551416. Its totient is φ = 777775704.

The previous prime is 1166663543. The next prime is 1166663609. The reversal of 1166663559 is 9553666611.

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

It is not a de Polignac number, because 1166663559 - 2⁴ = 1166663543 is a prime.

It is a super-2 number, since 2×1166663559² = 2722207719797092962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166663759) 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 3 ways as a sum of consecutive naturals, for example, 194443924 + ... + 194443929.

It is an arithmetic number, because the mean of its divisors is an integer number (388887854).

Almost surely, 2^1166663559 is an apocalyptic number.

1166663559 is a deficient number, since it is larger than the sum of its proper divisors (388887857).

1166663559 is an equidigital number, since it uses as much as digits as its factorization.

1166663559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388887856.

The product of its digits is 874800, while the sum is 48.

The square root of 1166663559 is about 34156.4570615865. The cubic root of 1166663559 is about 1052.7256648876.

The spelling of 1166663559 in words is "one billion, one hundred sixty-six million, six hundred sixty-three thousand, five hundred fifty-nine".