123344566789 has 4 divisors (see below), whose sum is σ = 123346778860. Its totient is φ = 123342354720.

The previous prime is 123344566753. The next prime is 123344566799. The reversal of 123344566789 is 987665443321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 987665443321 = 31 ⋅31860175591.

It can be written as a sum of positive squares in 2 ways, for example, as 53653846689 + 69690720100 = 231633^2 + 263990^2 .

It is a cyclic number.

It is not a de Polignac number, because 123344566789 - 2⁹ = 123344566277 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123344566799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020174 + ... + 1134655.

It is an arithmetic number, because the mean of its divisors is an integer number (30836694715).

Almost surely, 2^123344566789 is an apocalyptic number.

It is an amenable number.

123344566789 is a deficient number, since it is larger than the sum of its proper divisors (2212071).

123344566789 is an equidigital number, since it uses as much as digits as its factorization.

123344566789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212070.

The product of its digits is 26127360, while the sum is 58.

The spelling of 123344566789 in words is "one hundred twenty-three billion, three hundred forty-four million, five hundred sixty-six thousand, seven hundred eighty-nine".