257850754247 has 2 divisors, whose sum is σ = 257850754248. Its totient is φ = 257850754246.

The previous prime is 257850754229. The next prime is 257850754279. The reversal of 257850754247 is 742457058752.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257850754247 - 2⁸ = 257850753991 is a prime.

It is a super-2 number, since 2×257850754247² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257850754192 and 257850754201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257850754547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128925377123 + 128925377124.

It is an arithmetic number, because the mean of its divisors is an integer number (128925377124).

Almost surely, 2^257850754247 is an apocalyptic number.

257850754247 is a deficient number, since it is larger than the sum of its proper divisors (1).

257850754247 is an equidigital number, since it uses as much as digits as its factorization.

257850754247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21952000, while the sum is 56.

The spelling of 257850754247 in words is "two hundred fifty-seven billion, eight hundred fifty million, seven hundred fifty-four thousand, two hundred forty-seven".