256303303541491 has 2 divisors, whose sum is σ = 256303303541492. Its totient is φ = 256303303541490.

The previous prime is 256303303541479. The next prime is 256303303541591. The reversal of 256303303541491 is 194145303303652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256303303541491 - 2¹⁷ = 256303303410419 is a prime.

It is not a weakly prime, because it can be changed into another prime (256303303541401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128151651770745 + 128151651770746.

It is an arithmetic number, because the mean of its divisors is an integer number (128151651770746).

Almost surely, 2^{256303303541491} is an apocalyptic number.

256303303541491 is a deficient number, since it is larger than the sum of its proper divisors (1).

256303303541491 is an equidigital number, since it uses as much as digits as its factorization.

256303303541491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3499200, while the sum is 49.

The spelling of 256303303541491 in words is "two hundred fifty-six trillion, three hundred three billion, three hundred three million, five hundred forty-one thousand, four hundred ninety-one".