1166123279 has 4 divisors (see below), whose sum is σ = 1234718784. Its totient is φ = 1097527776.

The previous prime is 1166123239. The next prime is 1166123297. The reversal of 1166123279 is 9723216611.

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

It is a cyclic number.

It is not a de Polignac number, because 1166123279 - 2¹⁶ = 1166057743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166123239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34297727 + ... + 34297760.

It is an arithmetic number, because the mean of its divisors is an integer number (308679696).

Almost surely, 2^1166123279 is an apocalyptic number.

1166123279 is a deficient number, since it is larger than the sum of its proper divisors (68595505).

1166123279 is an equidigital number, since it uses as much as digits as its factorization.

1166123279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68595504.

The product of its digits is 27216, while the sum is 38.

The square root of 1166123279 is about 34148.5472458200. The cubic root of 1166123279 is about 1052.5631346138.

The spelling of 1166123279 in words is "one billion, one hundred sixty-six million, one hundred twenty-three thousand, two hundred seventy-nine".