255318118243117 has 2 divisors, whose sum is σ = 255318118243118. Its totient is φ = 255318118243116.

The previous prime is 255318118243109. The next prime is 255318118243151. The reversal of 255318118243117 is 711342811813552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254147969796361 + 1170148446756 = 15942019^2 + 1081734^2 .

It is a cyclic number.

It is not a de Polignac number, because 255318118243117 - 2³ = 255318118243109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255318118244117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127659059121558 + 127659059121559.

It is an arithmetic number, because the mean of its divisors is an integer number (127659059121559).

Almost surely, 2^{255318118243117} is an apocalyptic number.

It is an amenable number.

255318118243117 is a deficient number, since it is larger than the sum of its proper divisors (1).

255318118243117 is an equidigital number, since it uses as much as digits as its factorization.

255318118243117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 52.

The spelling of 255318118243117 in words is "two hundred fifty-five trillion, three hundred eighteen billion, one hundred eighteen million, two hundred forty-three thousand, one hundred seventeen".