1166266999 has 4 divisors (see below), whose sum is σ = 1167337080. Its totient is φ = 1165196920.

The previous prime is 1166266993. The next prime is 1166267009. The reversal of 1166266999 is 9996626611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9996626611 = 10709 ⋅933479.

It is a cyclic number.

It is not a de Polignac number, because 1166266999 - 2²³ = 1157878391 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 (1166266993) 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, 533404 + ... + 535585.

It is an arithmetic number, because the mean of its divisors is an integer number (291834270).

Almost surely, 2^1166266999 is an apocalyptic number.

1166266999 is a deficient number, since it is larger than the sum of its proper divisors (1070081).

1166266999 is a wasteful number, since it uses less digits than its factorization.

1166266999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070080.

The product of its digits is 1889568, while the sum is 55.

The square root of 1166266999 is about 34150.6515164792. The cubic root of 1166266999 is about 1052.6063742272.

The spelling of 1166266999 in words is "one billion, one hundred sixty-six million, two hundred sixty-six thousand, nine hundred ninety-nine".