172123543243 has 2 divisors, whose sum is σ = 172123543244. Its totient is φ = 172123543242.

The previous prime is 172123543127. The next prime is 172123543259. The reversal of 172123543243 is 342345321271.

172123543243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172123543243 is a prime.

It is not a weakly prime, because it can be changed into another prime (172123543043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86061771621 + 86061771622.

It is an arithmetic number, because the mean of its divisors is an integer number (86061771622).

Almost surely, 2^172123543243 is an apocalyptic number.

172123543243 is a deficient number, since it is larger than the sum of its proper divisors (1).

172123543243 is an equidigital number, since it uses as much as digits as its factorization.

172123543243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 37.

The spelling of 172123543243 in words is "one hundred seventy-two billion, one hundred twenty-three million, five hundred forty-three thousand, two hundred forty-three".