257203643 has 2 divisors, whose sum is σ = 257203644. Its totient is φ = 257203642.

The previous prime is 257203631. The next prime is 257203657. The reversal of 257203643 is 346302752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257203643 - 2⁶ = 257203579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (257203603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128601821 + 128601822.

It is an arithmetic number, because the mean of its divisors is an integer number (128601822).

Almost surely, 2^257203643 is an apocalyptic number.

257203643 is a deficient number, since it is larger than the sum of its proper divisors (1).

257203643 is an equidigital number, since it uses as much as digits as its factorization.

257203643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 32.

The square root of 257203643 is about 16037.5697348445. The cubic root of 257203643 is about 635.9540028111.

The spelling of 257203643 in words is "two hundred fifty-seven million, two hundred three thousand, six hundred forty-three".