123666666321 has 16 divisors (see below), whose sum is σ = 184740378048. Its totient is φ = 72923832000.

The previous prime is 123666666307. The next prime is 123666666341.

123666666321 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 123666666321 - 2⁵ = 123666666289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123666666341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50640330 + ... + 50642771.

It is an arithmetic number, because the mean of its divisors is an integer number (11546273628).

Almost surely, 2^123666666321 is an apocalyptic number.

123666666321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123666666321 is a deficient number, since it is larger than the sum of its proper divisors (61073711727).

123666666321 is a wasteful number, since it uses less digits than its factorization.

123666666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101283152.

The product of its digits is 1679616, while the sum is 48.

It can be divided in two parts, 123666 and 666321, that added together give a palindrome (789987).

The spelling of 123666666321 in words is "one hundred twenty-three billion, six hundred sixty-six million, six hundred sixty-six thousand, three hundred twenty-one".