266897257129 has 2 divisors, whose sum is σ = 266897257130. Its totient is φ = 266897257128.

The previous prime is 266897257069. The next prime is 266897257139. The reversal of 266897257129 is 921752798662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244182245904 + 22715011225 = 494148^2 + 150715^2 .

It is a cyclic number.

It is not a de Polignac number, because 266897257129 - 2¹¹ = 266897255081 is a prime.

It is not a weakly prime, because it can be changed into another prime (266897257139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133448628564 + 133448628565.

It is an arithmetic number, because the mean of its divisors is an integer number (133448628565).

Almost surely, 2^266897257129 is an apocalyptic number.

It is an amenable number.

266897257129 is a deficient number, since it is larger than the sum of its proper divisors (1).

266897257129 is an equidigital number, since it uses as much as digits as its factorization.

266897257129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45722880, while the sum is 64.

The spelling of 266897257129 in words is "two hundred sixty-six billion, eight hundred ninety-seven million, two hundred fifty-seven thousand, one hundred twenty-nine".