257729952173 has 2 divisors, whose sum is σ = 257729952174. Its totient is φ = 257729952172.

The previous prime is 257729952167. The next prime is 257729952197. The reversal of 257729952173 is 371259927752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 257579595529 + 150356644 = 507523^2 + 12262^2 .

It is a cyclic number.

It is not a de Polignac number, because 257729952173 - 2³⁴ = 240550082989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257729952133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128864976086 + 128864976087.

It is an arithmetic number, because the mean of its divisors is an integer number (128864976087).

Almost surely, 2^257729952173 is an apocalyptic number.

It is an amenable number.

257729952173 is a deficient number, since it is larger than the sum of its proper divisors (1).

257729952173 is an equidigital number, since it uses as much as digits as its factorization.

257729952173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16669800, while the sum is 59.

The spelling of 257729952173 in words is "two hundred fifty-seven billion, seven hundred twenty-nine million, nine hundred fifty-two thousand, one hundred seventy-three".