266716727129 has 2 divisors, whose sum is σ = 266716727130. Its totient is φ = 266716727128.

The previous prime is 266716727071. The next prime is 266716727153. The reversal of 266716727129 is 921727617662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236704629529 + 30012097600 = 486523^2 + 173240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266716727129 is a prime.

It is a super-4 number, since 4×266716727129⁴ (a number of 47 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (266716727729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133358363564 + 133358363565.

It is an arithmetic number, because the mean of its divisors is an integer number (133358363565).

Almost surely, 2^266716727129 is an apocalyptic number.

It is an amenable number.

266716727129 is a deficient number, since it is larger than the sum of its proper divisors (1).

266716727129 is an equidigital number, since it uses as much as digits as its factorization.

266716727129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 56.

The spelling of 266716727129 in words is "two hundred sixty-six billion, seven hundred sixteen million, seven hundred twenty-seven thousand, one hundred twenty-nine".