257233663 has 2 divisors, whose sum is σ = 257233664. Its totient is φ = 257233662.

The previous prime is 257233661. The next prime is 257233693. The reversal of 257233663 is 366332752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257233663 - 2¹ = 257233661 is a prime.

Together with 257233661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257233661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128616831 + 128616832.

It is an arithmetic number, because the mean of its divisors is an integer number (128616832).

Almost surely, 2^257233663 is an apocalyptic number.

257233663 is a deficient number, since it is larger than the sum of its proper divisors (1).

257233663 is an equidigital number, since it uses as much as digits as its factorization.

257233663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 37.

The square root of 257233663 is about 16038.5056348776. The cubic root of 257233663 is about 635.9787440320.

The spelling of 257233663 in words is "two hundred fifty-seven million, two hundred thirty-three thousand, six hundred sixty-three".