257748618989 has 2 divisors, whose sum is σ = 257748618990. Its totient is φ = 257748618988.

The previous prime is 257748618983. The next prime is 257748619027. The reversal of 257748618989 is 989816847752.

257748618989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190670208964 + 67078410025 = 436658^2 + 258995^2 .

It is a cyclic number.

It is not a de Polignac number, because 257748618989 - 2⁸ = 257748618733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257748618983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128874309494 + 128874309495.

It is an arithmetic number, because the mean of its divisors is an integer number (128874309495).

Almost surely, 2^257748618989 is an apocalyptic number.

It is an amenable number.

257748618989 is a deficient number, since it is larger than the sum of its proper divisors (1).

257748618989 is an equidigital number, since it uses as much as digits as its factorization.

257748618989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 487710720, while the sum is 74.

The spelling of 257748618989 in words is "two hundred fifty-seven billion, seven hundred forty-eight million, six hundred eighteen thousand, nine hundred eighty-nine".