123531440666 has 8 divisors (see below), whose sum is σ = 187906980384. Its totient is φ = 60895780540.

The previous prime is 123531440653. The next prime is 123531440689. The reversal of 123531440666 is 666044135321.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434969720 + ... + 434970003.

It is an arithmetic number, because the mean of its divisors is an integer number (23488372548).

Almost surely, 2^123531440666 is an apocalyptic number.

123531440666 is a deficient number, since it is larger than the sum of its proper divisors (64375539718).

123531440666 is an equidigital number, since it uses as much as digits as its factorization.

123531440666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869939796.

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 123531440666 its reverse (666044135321), we get a palindrome (789575575987).

The spelling of 123531440666 in words is "one hundred twenty-three billion, five hundred thirty-one million, four hundred forty thousand, six hundred sixty-six".