123240355440173 has 2 divisors, whose sum is σ = 123240355440174. Its totient is φ = 123240355440172.

The previous prime is 123240355440161. The next prime is 123240355440187. The reversal of 123240355440173 is 371044553042321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82295432452489 + 40944922987684 = 9071683^2 + 6398822^2 .

It is an emirp because it is prime and its reverse (371044553042321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123240355440173 - 2¹⁴ = 123240355423789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123240355440773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61620177720086 + 61620177720087.

It is an arithmetic number, because the mean of its divisors is an integer number (61620177720087).

Almost surely, 2^{123240355440173} is an apocalyptic number.

It is an amenable number.

123240355440173 is a deficient number, since it is larger than the sum of its proper divisors (1).

123240355440173 is an equidigital number, since it uses as much as digits as its factorization.

123240355440173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 44.

The spelling of 123240355440173 in words is "one hundred twenty-three trillion, two hundred forty billion, three hundred fifty-five million, four hundred forty thousand, one hundred seventy-three".