266647271641 has 9 divisors (see below), whose sum is σ = 271801175359. Its totient is φ = 261589339336.

The previous prime is 266647271599. The next prime is 266647271647. The reversal of 266647271641 is 146172746662.

The square root of 266647271641 is 516379.

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., 192225249225 + 74422022416 = 438435^2 + 272804^2 .

It is not a de Polignac number, because 266647271641 - 2²¹ = 266645174489 is a prime.

It is a super-2 number, since 2×266647271641² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266647271647) 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, 27363216 + ... + 27372958.

Almost surely, 2^266647271641 is an apocalyptic number.

266647271641 is the 516379-th square number.

266647271641 is the 258190-th centered octagonal number.

It is an amenable number.

266647271641 is a deficient number, since it is larger than the sum of its proper divisors (5153903718).

266647271641 is an frugal number, since it uses more digits than its factorization.

266647271641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19592 (or 9796 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 52.

The spelling of 266647271641 in words is "two hundred sixty-six billion, six hundred forty-seven million, two hundred seventy-one thousand, six hundred forty-one".