123115666 has 8 divisors (see below), whose sum is σ = 195536700. Its totient is φ = 57936768.

The previous prime is 123115639. The next prime is 123115669. The reversal of 123115666 is 666511321.

It can be written as a sum of positive squares in 2 ways, for example, as 123099025 + 16641 = 11095^2 + 129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (123115669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1810491 + ... + 1810558.

Almost surely, 2^123115666 is an apocalyptic number.

123115666 is a deficient number, since it is larger than the sum of its proper divisors (72421034).

123115666 is a wasteful number, since it uses less digits than its factorization.

123115666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621068.

The product of its digits is 6480, while the sum is 31.

The square root of 123115666 is about 11095.7499070590. The cubic root of 123115666 is about 497.4748230990.

Adding to 123115666 its reverse (666511321), we get a palindrome (789626987).

The spelling of 123115666 in words is "one hundred twenty-three million, one hundred fifteen thousand, six hundred sixty-six".