256444420403 has 2 divisors, whose sum is σ = 256444420404. Its totient is φ = 256444420402.

The previous prime is 256444420399. The next prime is 256444420409. The reversal of 256444420403 is 304024444652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256444420403 - 2² = 256444420399 is a prime.

It is not a weakly prime, because it can be changed into another prime (256444420409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128222210201 + 128222210202.

It is an arithmetic number, because the mean of its divisors is an integer number (128222210202).

Almost surely, 2^256444420403 is an apocalyptic number.

256444420403 is a deficient number, since it is larger than the sum of its proper divisors (1).

256444420403 is an equidigital number, since it uses as much as digits as its factorization.

256444420403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 368640, while the sum is 38.

The spelling of 256444420403 in words is "two hundred fifty-six billion, four hundred forty-four million, four hundred twenty thousand, four hundred three".