257747640287 has 2 divisors, whose sum is σ = 257747640288. Its totient is φ = 257747640286.

The previous prime is 257747640277. The next prime is 257747640299. The reversal of 257747640287 is 782046747752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257747640287 - 2⁶ = 257747640223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257747640277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128873820143 + 128873820144.

It is an arithmetic number, because the mean of its divisors is an integer number (128873820144).

Almost surely, 2^257747640287 is an apocalyptic number.

257747640287 is a deficient number, since it is larger than the sum of its proper divisors (1).

257747640287 is an equidigital number, since it uses as much as digits as its factorization.

257747640287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36879360, while the sum is 59.

The spelling of 257747640287 in words is "two hundred fifty-seven billion, seven hundred forty-seven million, six hundred forty thousand, two hundred eighty-seven".