256645303 has 2 divisors, whose sum is σ = 256645304. Its totient is φ = 256645302.

The previous prime is 256645267. The next prime is 256645307. The reversal of 256645303 is 303546652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256645303 - 2¹³ = 256637111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256645307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128322651 + 128322652.

It is an arithmetic number, because the mean of its divisors is an integer number (128322652).

Almost surely, 2^256645303 is an apocalyptic number.

256645303 is a deficient number, since it is larger than the sum of its proper divisors (1).

256645303 is an equidigital number, since it uses as much as digits as its factorization.

256645303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 34.

The square root of 256645303 is about 16020.1530267348. The cubic root of 256645303 is about 635.4934911843.

The spelling of 256645303 in words is "two hundred fifty-six million, six hundred forty-five thousand, three hundred three".