257663243 has 4 divisors (see below), whose sum is σ = 258788640. Its totient is φ = 256537848.

The previous prime is 257663239. The next prime is 257663251. The reversal of 257663243 is 342366752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257663243 - 2² = 257663239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 257663197 and 257663206.

It is not an unprimeable number, because it can be changed into a prime (257666243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562355 + ... + 562812.

It is an arithmetic number, because the mean of its divisors is an integer number (64697160).

Almost surely, 2^257663243 is an apocalyptic number.

257663243 is a deficient number, since it is larger than the sum of its proper divisors (1125397).

257663243 is a wasteful number, since it uses less digits than its factorization.

257663243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125396.

The product of its digits is 181440, while the sum is 38.

The square root of 257663243 is about 16051.8921937571. The cubic root of 257663243 is about 636.3325751277.

The spelling of 257663243 in words is "two hundred fifty-seven million, six hundred sixty-three thousand, two hundred forty-three".