1255122643517 has 2 divisors, whose sum is σ = 1255122643518. Its totient is φ = 1255122643516.

The previous prime is 1255122643457. The next prime is 1255122643543. The reversal of 1255122643517 is 7153462215521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1129669253881 + 125453389636 = 1062859^2 + 354194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255122643517 - 2¹⁴ = 1255122627133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1255122643217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627561321758 + 627561321759.

It is an arithmetic number, because the mean of its divisors is an integer number (627561321759).

Almost surely, 2^{1255122643517} is an apocalyptic number.

It is an amenable number.

1255122643517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255122643517 is an equidigital number, since it uses as much as digits as its factorization.

1255122643517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504000, while the sum is 44.

The spelling of 1255122643517 in words is "one trillion, two hundred fifty-five billion, one hundred twenty-two million, six hundred forty-three thousand, five hundred seventeen".