256303303541591 has 2 divisors, whose sum is σ = 256303303541592. Its totient is φ = 256303303541590.

The previous prime is 256303303541491. The next prime is 256303303541617. The reversal of 256303303541591 is 195145303303652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256303303541591 is a prime.

It is a super-2 number, since 2×256303303541591² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256303303541291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128151651770795 + 128151651770796.

It is an arithmetic number, because the mean of its divisors is an integer number (128151651770796).

Almost surely, 2^{256303303541591} is an apocalyptic number.

256303303541591 is a deficient number, since it is larger than the sum of its proper divisors (1).

256303303541591 is an equidigital number, since it uses as much as digits as its factorization.

256303303541591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374000, while the sum is 50.

The spelling of 256303303541591 in words is "two hundred fifty-six trillion, three hundred three billion, three hundred three million, five hundred forty-one thousand, five hundred ninety-one".