255634975861 has 2 divisors, whose sum is σ = 255634975862. Its totient is φ = 255634975860.

The previous prime is 255634975801. The next prime is 255634975943. The reversal of 255634975861 is 168579436552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253330015761 + 2304960100 = 503319^2 + 48010^2 .

It is a cyclic number.

It is not a de Polignac number, because 255634975861 - 2²³ = 255626587253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255634975861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255634975801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127817487930 + 127817487931.

It is an arithmetic number, because the mean of its divisors is an integer number (127817487931).

Almost surely, 2^255634975861 is an apocalyptic number.

It is an amenable number.

255634975861 is a deficient number, since it is larger than the sum of its proper divisors (1).

255634975861 is an equidigital number, since it uses as much as digits as its factorization.

255634975861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432000, while the sum is 61.

The spelling of 255634975861 in words is "two hundred fifty-five billion, six hundred thirty-four million, nine hundred seventy-five thousand, eight hundred sixty-one".