266843531761 has 9 divisors (see below), whose sum is σ = 267685601889. Its totient is φ = 266004107136.

The previous prime is 266843531737. The next prime is 266843531767. The reversal of 266843531761 is 167135348662.

The square root of 266843531761 is 516569.

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

266843531761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 46432061361 + 220411470400 = 215481^2 + 469480^2 .

It is a de Polignac number, because none of the positive numbers 2^k-266843531761 is a prime.

It is a super-2 number, since 2×266843531761² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 266843531699 and 266843531708.

It is not an unprimeable number, because it can be changed into a prime (266843531767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 223673781 + ... + 223674973.

Almost surely, 2^266843531761 is an apocalyptic number.

266843531761 is the 516569-th square number.

266843531761 is the 258285-th centered octagonal number.

It is an amenable number.

266843531761 is a deficient number, since it is larger than the sum of its proper divisors (842070128).

266843531761 is an frugal number, since it uses more digits than its factorization.

266843531761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252 (or 1626 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 52.

The spelling of 266843531761 in words is "two hundred sixty-six billion, eight hundred forty-three million, five hundred thirty-one thousand, seven hundred sixty-one".