203943172157 has 2 divisors, whose sum is σ = 203943172158. Its totient is φ = 203943172156.

The previous prime is 203943172099. The next prime is 203943172219. The reversal of 203943172157 is 751271349302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106283172121 + 97660000036 = 326011^2 + 312506^2 .

It is a cyclic number.

It is not a de Polignac number, because 203943172157 - 2¹⁸ = 203942910013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203943172457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101971586078 + 101971586079.

It is an arithmetic number, because the mean of its divisors is an integer number (101971586079).

Almost surely, 2^203943172157 is an apocalyptic number.

It is an amenable number.

203943172157 is a deficient number, since it is larger than the sum of its proper divisors (1).

203943172157 is an equidigital number, since it uses as much as digits as its factorization.

203943172157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 203943172157 in words is "two hundred three billion, nine hundred forty-three million, one hundred seventy-two thousand, one hundred fifty-seven".