755123666319509 has 2 divisors, whose sum is σ = 755123666319510. Its totient is φ = 755123666319508.

The previous prime is 755123666319467. The next prime is 755123666319511. The reversal of 755123666319509 is 905913666321557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625780743672100 + 129342922647409 = 25015610^2 + 11372903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-755123666319509 is a prime.

Together with 755123666319511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (755123666319559) 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, 377561833159754 + 377561833159755.

It is an arithmetic number, because the mean of its divisors is an integer number (377561833159755).

Almost surely, 2^{755123666319509} is an apocalyptic number.

It is an amenable number.

755123666319509 is a deficient number, since it is larger than the sum of its proper divisors (1).

755123666319509 is an equidigital number, since it uses as much as digits as its factorization.

755123666319509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 275562000, while the sum is 68.

The spelling of 755123666319509 in words is "seven hundred fifty-five trillion, one hundred twenty-three billion, six hundred sixty-six million, three hundred nineteen thousand, five hundred nine".