257297358377 has 2 divisors, whose sum is σ = 257297358378. Its totient is φ = 257297358376.

The previous prime is 257297358361. The next prime is 257297358391. The reversal of 257297358377 is 773853792752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155227332121 + 102070026256 = 393989^2 + 319484^2 .

It is a cyclic number.

It is not a de Polignac number, because 257297358377 - 2⁴ = 257297358361 is a prime.

It is not a weakly prime, because it can be changed into another prime (257297358337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128648679188 + 128648679189.

It is an arithmetic number, because the mean of its divisors is an integer number (128648679189).

Almost surely, 2^257297358377 is an apocalyptic number.

It is an amenable number.

257297358377 is a deficient number, since it is larger than the sum of its proper divisors (1).

257297358377 is an equidigital number, since it uses as much as digits as its factorization.

257297358377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155584800, while the sum is 65.

The spelling of 257297358377 in words is "two hundred fifty-seven billion, two hundred ninety-seven million, three hundred fifty-eight thousand, three hundred seventy-seven".