1123205666 has 16 divisors (see below), whose sum is σ = 1880718048. Its totient is φ = 498674400.

The previous prime is 1123205639. The next prime is 1123205669. The reversal of 1123205666 is 6665023211.

It is not an unprimeable number, because it can be changed into a prime (1123205669) 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, 592715 + ... + 594606.

It is an arithmetic number, because the mean of its divisors is an integer number (117544878).

Almost surely, 2^1123205666 is an apocalyptic number.

1123205666 is a deficient number, since it is larger than the sum of its proper divisors (757512382).

1123205666 is a wasteful number, since it uses less digits than its factorization.

1123205666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187377.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1123205666 is about 33514.2606363321. The cubic root of 1123205666 is about 1039.4886743088.

Adding to 1123205666 its reverse (6665023211), we get a palindrome (7788228877).

The spelling of 1123205666 in words is "one billion, one hundred twenty-three million, two hundred five thousand, six hundred sixty-six".