1166556666 has 64 divisors (see below), whose sum is σ = 2590963200. Its totient is φ = 347208000.

The previous prime is 1166556647. The next prime is 1166556689. The reversal of 1166556666 is 6666556611.

1166556666 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 925945 + ... + 927203.

It is an arithmetic number, because the mean of its divisors is an integer number (40483800).

Almost surely, 2^1166556666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1166556666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295481600).

1166556666 is an abundant number, since it is smaller than the sum of its proper divisors (1424406534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1166556666 is a wasteful number, since it uses less digits than its factorization.

1166556666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515.

The product of its digits is 1166400, while the sum is 48.

The square root of 1166556666 is about 34154.8922703615. The cubic root of 1166556666 is about 1052.6935126758.

Subtracting 1166556666 from its reverse (6666556611), we obtain a palindrome (5499999945).

It can be divided in two parts, 116655 and 6666, that added together give a palindrome (123321).

The spelling of 1166556666 in words is "one billion, one hundred sixty-six million, five hundred fifty-six thousand, six hundred sixty-six".