266427912556517 has 2 divisors, whose sum is σ = 266427912556518. Its totient is φ = 266427912556516.

The previous prime is 266427912556501. The next prime is 266427912556583. The reversal of 266427912556517 is 715655219724662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230777388266881 + 35650524289636 = 15191359^2 + 5970806^2 .

It is a cyclic number.

It is not a de Polignac number, because 266427912556517 - 2⁴ = 266427912556501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266427912556417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133213956278258 + 133213956278259.

It is an arithmetic number, because the mean of its divisors is an integer number (133213956278259).

Almost surely, 2^{266427912556517} is an apocalyptic number.

It is an amenable number.

266427912556517 is a deficient number, since it is larger than the sum of its proper divisors (1).

266427912556517 is an equidigital number, since it uses as much as digits as its factorization.

266427912556517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024000, while the sum is 68.

The spelling of 266427912556517 in words is "two hundred sixty-six trillion, four hundred twenty-seven billion, nine hundred twelve million, five hundred fifty-six thousand, five hundred seventeen".