257703643 has 2 divisors, whose sum is σ = 257703644. Its totient is φ = 257703642.

The previous prime is 257703623. The next prime is 257703647. The reversal of 257703643 is 346307752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257703643 is a prime.

It is a super-2 number, since 2×257703643² = 132822335230942898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257703647) 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, 128851821 + 128851822.

It is an arithmetic number, because the mean of its divisors is an integer number (128851822).

Almost surely, 2^257703643 is an apocalyptic number.

257703643 is a deficient number, since it is larger than the sum of its proper divisors (1).

257703643 is an equidigital number, since it uses as much as digits as its factorization.

257703643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 37.

The square root of 257703643 is about 16053.1505630515. The cubic root of 257703643 is about 636.3658310580.

The spelling of 257703643 in words is "two hundred fifty-seven million, seven hundred three thousand, six hundred forty-three".