127255744265581 has 2 divisors, whose sum is σ = 127255744265582. Its totient is φ = 127255744265580.

The previous prime is 127255744265539. The next prime is 127255744265593. The reversal of 127255744265581 is 185562447552721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79235972328681 + 48019771936900 = 8901459^2 + 6929630^2 .

It is an emirp because it is prime and its reverse (185562447552721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127255744265581 is a prime.

It is a super-2 number, since 2×127255744265581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127255744265501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63627872132790 + 63627872132791.

It is an arithmetic number, because the mean of its divisors is an integer number (63627872132791).

Almost surely, 2^{127255744265581} is an apocalyptic number.

It is an amenable number.

127255744265581 is a deficient number, since it is larger than the sum of its proper divisors (1).

127255744265581 is an equidigital number, since it uses as much as digits as its factorization.

127255744265581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160000, while the sum is 64.

The spelling of 127255744265581 in words is "one hundred twenty-seven trillion, two hundred fifty-five billion, seven hundred forty-four million, two hundred sixty-five thousand, five hundred eighty-one".