255963430391 has 2 divisors, whose sum is σ = 255963430392. Its totient is φ = 255963430390.

The previous prime is 255963430361. The next prime is 255963430399. The reversal of 255963430391 is 193034369552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255963430391 - 2¹⁸ = 255963168247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255963430399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127981715195 + 127981715196.

It is an arithmetic number, because the mean of its divisors is an integer number (127981715196).

Almost surely, 2^255963430391 is an apocalyptic number.

255963430391 is a deficient number, since it is larger than the sum of its proper divisors (1).

255963430391 is an equidigital number, since it uses as much as digits as its factorization.

255963430391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2624400, while the sum is 50.

The spelling of 255963430391 in words is "two hundred fifty-five billion, nine hundred sixty-three million, four hundred thirty thousand, three hundred ninety-one".