1188723666 has 16 divisors (see below), whose sum is σ = 2560328064. Its totient is φ = 365761104.

The previous prime is 1188723539. The next prime is 1188723667. The reversal of 1188723666 is 6663278811.

It is not an unprimeable number, because it can be changed into a prime (1188723667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7619946 + ... + 7620101.

It is an arithmetic number, because the mean of its divisors is an integer number (160020504).

Almost surely, 2^1188723666 is an apocalyptic number.

1188723666 is an abundant number, since it is smaller than the sum of its proper divisors (1371604398).

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

1188723666 is a wasteful number, since it uses less digits than its factorization.

1188723666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15240065.

The product of its digits is 580608, while the sum is 48.

The square root of 1188723666 is about 34477.8721211156. The cubic root of 1188723666 is about 1059.3195068677.

It can be divided in two parts, 11887 and 23666, that added together give a palindrome (35553).

The spelling of 1188723666 in words is "one billion, one hundred eighty-eight million, seven hundred twenty-three thousand, six hundred sixty-six".