257557543 has 2 divisors, whose sum is σ = 257557544. Its totient is φ = 257557542.

The previous prime is 257557507. The next prime is 257557571. The reversal of 257557543 is 345755752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257557543 - 2²⁵ = 224003111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257557543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257557043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128778771 + 128778772.

It is an arithmetic number, because the mean of its divisors is an integer number (128778772).

Almost surely, 2^257557543 is an apocalyptic number.

257557543 is a deficient number, since it is larger than the sum of its proper divisors (1).

257557543 is an equidigital number, since it uses as much as digits as its factorization.

257557543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 735000, while the sum is 43.

The square root of 257557543 is about 16048.5994092943. The cubic root of 257557543 is about 636.2455499706.

The spelling of 257557543 in words is "two hundred fifty-seven million, five hundred fifty-seven thousand, five hundred forty-three".