255721546837 has 2 divisors, whose sum is σ = 255721546838. Its totient is φ = 255721546836.

The previous prime is 255721546807. The next prime is 255721546841. The reversal of 255721546837 is 738645127552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218244071556 + 37477475281 = 467166^2 + 193591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255721546837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255721546807) 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, 127860773418 + 127860773419.

It is an arithmetic number, because the mean of its divisors is an integer number (127860773419).

Almost surely, 2^255721546837 is an apocalyptic number.

It is an amenable number.

255721546837 is a deficient number, since it is larger than the sum of its proper divisors (1).

255721546837 is an equidigital number, since it uses as much as digits as its factorization.

255721546837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112000, while the sum is 55.

The spelling of 255721546837 in words is "two hundred fifty-five billion, seven hundred twenty-one million, five hundred forty-six thousand, eight hundred thirty-seven".