266168287225 has 9 divisors (see below), whose sum is σ = 330051874863. Its totient is φ = 212932566120.

The previous prime is 266168287219. The next prime is 266168287261. The reversal of 266168287225 is 522782861662.

The square root of 266168287225 is 515915.

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., 95820583401 + 170347703824 = 309549^2 + 412732^2 .

It is not a de Polignac number, because 266168287225 - 2¹⁷ = 266168156153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2527984 + ... + 2631166.

Almost surely, 2^266168287225 is an apocalyptic number.

266168287225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

266168287225 is the 515915-th square number.

266168287225 is the 257958-th centered octagonal number.

It is an amenable number.

266168287225 is a deficient number, since it is larger than the sum of its proper divisors (63883587638).

266168287225 is an frugal number, since it uses more digits than its factorization.

266168287225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206376 (or 103188 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 55.

The spelling of 266168287225 in words is "two hundred sixty-six billion, one hundred sixty-eight million, two hundred eighty-seven thousand, two hundred twenty-five".