1123636666 has 4 divisors (see below), whose sum is σ = 1685455002. Its totient is φ = 561818332.

The previous prime is 1123636627. The next prime is 1123636669. The reversal of 1123636666 is 6666363211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1028164225 + 95472441 = 32065^2 + 9771^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1123636669) 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 as a sum of consecutive naturals, namely, 280909165 + ... + 280909168.

Almost surely, 2^1123636666 is an apocalyptic number.

1123636666 is a deficient number, since it is larger than the sum of its proper divisors (561818336).

1123636666 is an equidigital number, since it uses as much as digits as its factorization.

1123636666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561818335.

The product of its digits is 139968, while the sum is 40.

The square root of 1123636666 is about 33520.6901181942. The cubic root of 1123636666 is about 1039.6216159238.

Adding to 1123636666 its reverse (6666363211), we get a palindrome (7789999877).

The spelling of 1123636666 in words is "one billion, one hundred twenty-three million, six hundred thirty-six thousand, six hundred sixty-six".