123444566789 has 2 divisors, whose sum is σ = 123444566790. Its totient is φ = 123444566788.

The previous prime is 123444566783. The next prime is 123444566821. The reversal of 123444566789 is 987665444321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112052206564 + 11392360225 = 334742^2 + 106735^2 .

It is a cyclic number.

It is not a de Polignac number, because 123444566789 - 2¹⁶ = 123444501253 is a prime.

It is a super-2 number, since 2×123444566789² (a number of 23 digits) contains 22 as substring.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123444566783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61722283394 + 61722283395.

It is an arithmetic number, because the mean of its divisors is an integer number (61722283395).

Almost surely, 2^123444566789 is an apocalyptic number.

It is an amenable number.

123444566789 is a deficient number, since it is larger than the sum of its proper divisors (1).

123444566789 is an equidigital number, since it uses as much as digits as its factorization.

123444566789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 59.

The spelling of 123444566789 in words is "one hundred twenty-three billion, four hundred forty-four million, five hundred sixty-six thousand, seven hundred eighty-nine".