256623203267503 has 2 divisors, whose sum is σ = 256623203267504. Its totient is φ = 256623203267502.

The previous prime is 256623203267449. The next prime is 256623203267507. The reversal of 256623203267503 is 305762302326652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256623203267503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256623203267507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128311601633751 + 128311601633752.

It is an arithmetic number, because the mean of its divisors is an integer number (128311601633752).

Almost surely, 2^{256623203267503} is an apocalyptic number.

256623203267503 is a deficient number, since it is larger than the sum of its proper divisors (1).

256623203267503 is an equidigital number, since it uses as much as digits as its factorization.

256623203267503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16329600, while the sum is 52.

The spelling of 256623203267503 in words is "two hundred fifty-six trillion, six hundred twenty-three billion, two hundred three million, two hundred sixty-seven thousand, five hundred three".