203123161118173 has 2 divisors, whose sum is σ = 203123161118174. Its totient is φ = 203123161118172.

The previous prime is 203123161118159. The next prime is 203123161118203. The reversal of 203123161118173 is 371811161321302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189288012207204 + 13835148910969 = 13758198^2 + 3719563^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203123161118173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203123161118153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101561580559086 + 101561580559087.

It is an arithmetic number, because the mean of its divisors is an integer number (101561580559087).

Almost surely, 2^{203123161118173} is an apocalyptic number.

It is an amenable number.

203123161118173 is a deficient number, since it is larger than the sum of its proper divisors (1).

203123161118173 is an equidigital number, since it uses as much as digits as its factorization.

203123161118173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 203123161118173 in words is "two hundred three trillion, one hundred twenty-three billion, one hundred sixty-one million, one hundred eighteen thousand, one hundred seventy-three".