123405421323773 has 2 divisors, whose sum is σ = 123405421323774. Its totient is φ = 123405421323772.

The previous prime is 123405421323649. The next prime is 123405421323809. The reversal of 123405421323773 is 377323124504321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106228930654564 + 17176490669209 = 10306742^2 + 4144453^2 .

It is an emirp because it is prime and its reverse (377323124504321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123405421323773 - 2⁸ = 123405421323517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123405421323973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61702710661886 + 61702710661887.

It is an arithmetic number, because the mean of its divisors is an integer number (61702710661887).

Almost surely, 2^{123405421323773} is an apocalyptic number.

It is an amenable number.

123405421323773 is a deficient number, since it is larger than the sum of its proper divisors (1).

123405421323773 is an equidigital number, since it uses as much as digits as its factorization.

123405421323773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 47.

The spelling of 123405421323773 in words is "one hundred twenty-three trillion, four hundred five billion, four hundred twenty-one million, three hundred twenty-three thousand, seven hundred seventy-three".