266705729 has 2 divisors, whose sum is σ = 266705730. Its totient is φ = 266705728.

The previous prime is 266705633. The next prime is 266705743. The reversal of 266705729 is 927507662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216678400 + 50027329 = 14720^2 + 7073^2 .

It is a cyclic number.

It is not a de Polignac number, because 266705729 - 2⁸ = 266705473 is a prime.

It is a super-2 number, since 2×266705729² = 142263891762842882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266705729.

It is not a weakly prime, because it can be changed into another prime (266705759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133352864 + 133352865.

It is an arithmetic number, because the mean of its divisors is an integer number (133352865).

Almost surely, 2^266705729 is an apocalyptic number.

It is an amenable number.

266705729 is a deficient number, since it is larger than the sum of its proper divisors (1).

266705729 is an equidigital number, since it uses as much as digits as its factorization.

266705729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 266705729 is about 16331.1276095682. The cubic root of 266705729 is about 643.6910167594.

The spelling of 266705729 in words is "two hundred sixty-six million, seven hundred five thousand, seven hundred twenty-nine".