257998276243 has 2 divisors, whose sum is σ = 257998276244. Its totient is φ = 257998276242.

The previous prime is 257998276229. The next prime is 257998276297. The reversal of 257998276243 is 342672899752.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257998276243 is a prime.

It is a super-2 number, since 2×257998276243² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257998276223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128999138121 + 128999138122.

It is an arithmetic number, because the mean of its divisors is an integer number (128999138122).

Almost surely, 2^257998276243 is an apocalyptic number.

257998276243 is a deficient number, since it is larger than the sum of its proper divisors (1).

257998276243 is an equidigital number, since it uses as much as digits as its factorization.

257998276243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91445760, while the sum is 64.

The spelling of 257998276243 in words is "two hundred fifty-seven billion, nine hundred ninety-eight million, two hundred seventy-six thousand, two hundred forty-three".