266048721 has 9 divisors (see below), whose sum is σ = 384363291. Its totient is φ = 177333192.

The previous prime is 266048683. The next prime is 266048723. The reversal of 266048721 is 127840662.

The square root of 266048721 is 16311.

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

266048721 is a `hidden beast` number, since 26 + 604 + 8 + 7 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 150185025 + 115863696 = 12255^2 + 10764^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 266048721 - 2¹³ = 266040529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (266048723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 46215 + ... + 51651.

Almost surely, 2^266048721 is an apocalyptic number.

266048721 is the 16311-st square number.

266048721 is the 8156-th centered octagonal number.

It is an amenable number.

266048721 is a deficient number, since it is larger than the sum of its proper divisors (118314570).

266048721 is an frugal number, since it uses more digits than its factorization.

266048721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10880 (or 5440 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The cubic root of 266048721 is about 643.1620218837.

Multiplying 266048721 by its sum of digits (36), we get a square (9577753956 = 97866²).

The spelling of 266048721 in words is "two hundred sixty-six million, forty-eight thousand, seven hundred twenty-one".