1188666856 has 16 divisors (see below), whose sum is σ = 2400192900. Its totient is φ = 548615424.

The previous prime is 1188666839. The next prime is 1188666859. The reversal of 1188666856 is 6586668811.

It can be written as a sum of positive squares in 2 ways, for example, as 904204900 + 284461956 = 30070^2 + 16866^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1188666797 and 1188666806.

It is not an unprimeable number, because it can be changed into a prime (1188666859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5714641 + ... + 5714848.

Almost surely, 2^1188666856 is an apocalyptic number.

It is an amenable number.

1188666856 is an abundant number, since it is smaller than the sum of its proper divisors (1211526044).

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

1188666856 is a wasteful number, since it uses less digits than its factorization.

1188666856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11429508 (or 11429504 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The square root of 1188666856 is about 34477.0482495239. The cubic root of 1188666856 is about 1059.3026313730.

The spelling of 1188666856 in words is "one billion, one hundred eighty-eight million, six hundred sixty-six thousand, eight hundred fifty-six".