266135136173 has 2 divisors, whose sum is σ = 266135136174. Its totient is φ = 266135136172.

The previous prime is 266135136161. The next prime is 266135136191. The reversal of 266135136173 is 371631531662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201648596809 + 64486539364 = 449053^2 + 253942^2 .

It is a cyclic number.

It is not a de Polignac number, because 266135136173 - 2¹⁶ = 266135070637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266135136103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133067568086 + 133067568087.

It is an arithmetic number, because the mean of its divisors is an integer number (133067568087).

Almost surely, 2^266135136173 is an apocalyptic number.

It is an amenable number.

266135136173 is a deficient number, since it is larger than the sum of its proper divisors (1).

266135136173 is an equidigital number, since it uses as much as digits as its factorization.

266135136173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 44.

The spelling of 266135136173 in words is "two hundred sixty-six billion, one hundred thirty-five million, one hundred thirty-six thousand, one hundred seventy-three".