266744359729 has 9 divisors (see below), whose sum is σ = 273114719769. Its totient is φ = 260519310660.

The previous prime is 266744359681. The next prime is 266744359799. The reversal of 266744359729 is 927953447662.

The square root of 266744359729 is 516473.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 266744359729 - 2¹⁹ = 266743835441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266744359799) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22202334 + ... + 22214344.

Almost surely, 2^266744359729 is an apocalyptic number.

266744359729 is the 516473-rd square number.

266744359729 is the 258237-th centered octagonal number.

It is an amenable number.

266744359729 is a deficient number, since it is larger than the sum of its proper divisors (6370360040).

266744359729 is an frugal number, since it uses more digits than its factorization.

266744359729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24108 (or 12054 counting only the distinct ones).

The product of its digits is 137168640, while the sum is 64.

Multiplying 266744359729 by its sum of digits (64), we get a square (17071639022656 = 4131784²).

The spelling of 266744359729 in words is "two hundred sixty-six billion, seven hundred forty-four million, three hundred fifty-nine thousand, seven hundred twenty-nine".