266013131588281 has 27 divisors (see below), whose sum is σ = 340134098720367. Its totient is φ = 207281981084640.

The previous prime is 266013131588227. The next prime is 266013131588299. The reversal of 266013131588281 is 182885131310662.

It is a happy number.

The square root of 266013131588281 is 16309909.

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

It can be written as a sum of positive squares in only one way, i.e., 129404161604025 + 136608969984256 = 11375595^2 + 11687984^2 .

It is not a de Polignac number, because 266013131588281 - 2¹¹ = 266013131586233 is a prime.

It is a super-2 number, since 2×266013131588281² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266013131588381) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1255757085 + ... + 1255968901.

Almost surely, 2^{266013131588281} is an apocalyptic number.

266013131588281 is the 16309909-th square number.

266013131588281 is the 8154955-th centered octagonal number.

It is an amenable number.

266013131588281 is a deficient number, since it is larger than the sum of its proper divisors (74120967132086).

266013131588281 is an frugal number, since it uses more digits than its factorization.

266013131588281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423670 (or 211835 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 266013131588281 in words is "two hundred sixty-six trillion, thirteen billion, one hundred thirty-one million, five hundred eighty-eight thousand, two hundred eighty-one".