1166666789 has 16 divisors (see below), whose sum is σ = 1227916800. Its totient is φ = 1106345856.

The previous prime is 1166666771. The next prime is 1166666791. The reversal of 1166666789 is 9876666611.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166666789 is a prime.

It is a super-2 number, since 2×1166666789² = 2722222793111141042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166666729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2050097 + ... + 2050665.

It is an arithmetic number, because the mean of its divisors is an integer number (76744800).

Almost surely, 2^1166666789 is an apocalyptic number.

It is an amenable number.

1166666789 is a deficient number, since it is larger than the sum of its proper divisors (61250011).

1166666789 is a wasteful number, since it uses less digits than its factorization.

1166666789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204.

The product of its digits is 3919104, while the sum is 56.

The square root of 1166666789 is about 34156.5043439752. The cubic root of 1166666789 is about 1052.7266364047.

The spelling of 1166666789 in words is "one billion, one hundred sixty-six million, six hundred sixty-six thousand, seven hundred eighty-nine".