257340616243 has 2 divisors, whose sum is σ = 257340616244. Its totient is φ = 257340616242.

The previous prime is 257340616229. The next prime is 257340616261. The reversal of 257340616243 is 342616043752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257340616243 - 2⁹ = 257340615731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257340616243.

It is not a weakly prime, because it can be changed into another prime (257340616223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128670308121 + 128670308122.

It is an arithmetic number, because the mean of its divisors is an integer number (128670308122).

Almost surely, 2^257340616243 is an apocalyptic number.

257340616243 is a deficient number, since it is larger than the sum of its proper divisors (1).

257340616243 is an equidigital number, since it uses as much as digits as its factorization.

257340616243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 43.

Adding to 257340616243 its reverse (342616043752), we get a palindrome (599956659995).

The spelling of 257340616243 in words is "two hundred fifty-seven billion, three hundred forty million, six hundred sixteen thousand, two hundred forty-three".