1188666666 has 72 divisors (see below), whose sum is σ = 2903595552. Its totient is φ = 348526800.

The previous prime is 1188666653. The next prime is 1188666667. The reversal of 1188666666 is 6666668811.

1188666666 is a modest number, since divided by 66666 gives 11886 as remainder.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1188666667) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 187155 + ... + 193401.

It is an arithmetic number, because the mean of its divisors is an integer number (40327716).

Almost surely, 2^1188666666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1188666666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451797776).

1188666666 is an abundant number, since it is smaller than the sum of its proper divisors (1714928886).

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

1188666666 is a wasteful number, since it uses less digits than its factorization.

1188666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6328 (or 6294 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 1188666666 is about 34477.0454940675. The cubic root of 1188666666 is about 1059.3025749323.

The spelling of 1188666666 in words is "one billion, one hundred eighty-eight million, six hundred sixty-six thousand, six hundred sixty-six".