123344556789 has 4 divisors (see below), whose sum is σ = 164459409056. Its totient is φ = 82229704524.

The previous prime is 123344556781. The next prime is 123344556821. The reversal of 123344556789 is 987655443321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 123344556789 - 2³ = 123344556781 is a prime.

It is a Duffinian number.

It is a Curzon 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 (123344556781) 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, 20557426129 + ... + 20557426134.

It is an arithmetic number, because the mean of its divisors is an integer number (41114852264).

Almost surely, 2^123344556789 is an apocalyptic number.

It is an amenable number.

123344556789 is a deficient number, since it is larger than the sum of its proper divisors (41114852267).

123344556789 is an equidigital number, since it uses as much as digits as its factorization.

123344556789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41114852266.

The product of its digits is 21772800, while the sum is 57.

The spelling of 123344556789 in words is "one hundred twenty-three billion, three hundred forty-four million, five hundred fifty-six thousand, seven hundred eighty-nine".