255999999943 has 2 divisors, whose sum is σ = 255999999944. Its totient is φ = 255999999942.

The previous prime is 255999999919. The next prime is 255999999989. The reversal of 255999999943 is 349999999552.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255999999943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255999993943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127999999971 + 127999999972.

It is an arithmetic number, because the mean of its divisors is an integer number (127999999972).

Almost surely, 2^255999999943 is an apocalyptic number.

255999999943 is a deficient number, since it is larger than the sum of its proper divisors (1).

255999999943 is an equidigital number, since it uses as much as digits as its factorization.

255999999943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2869781400, while the sum is 82.

The spelling of 255999999943 in words is "two hundred fifty-five billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-three".