266820275129 has 2 divisors, whose sum is σ = 266820275130. Its totient is φ = 266820275128.

The previous prime is 266820275093. The next prime is 266820275171. The reversal of 266820275129 is 921572028662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264566209600 + 2254065529 = 514360^2 + 47477^2 .

It is a cyclic number.

It is not a de Polignac number, because 266820275129 - 2⁸ = 266820274873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (266820275329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133410137564 + 133410137565.

It is an arithmetic number, because the mean of its divisors is an integer number (133410137565).

Almost surely, 2^266820275129 is an apocalyptic number.

It is an amenable number.

266820275129 is a deficient number, since it is larger than the sum of its proper divisors (1).

266820275129 is an equidigital number, since it uses as much as digits as its factorization.

266820275129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 266820275129 in words is "two hundred sixty-six billion, eight hundred twenty million, two hundred seventy-five thousand, one hundred twenty-nine".