266343727225 has 9 divisors (see below), whose sum is σ = 330269421517. Its totient is φ = 213072917440.

The previous prime is 266343727217. The next prime is 266343727249. The reversal of 266343727225 is 522727343662.

The square root of 266343727225 is 516085.

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

It can be written as a sum of positive squares in 4 ways, for example, as 129890322409 + 136453404816 = 360403^2 + 369396^2 .

It is not a de Polignac number, because 266343727225 - 2³ = 266343727217 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 (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2528817 + ... + 2632033.

Almost surely, 2^266343727225 is an apocalyptic number.

266343727225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

266343727225 is the 516085-th square number.

266343727225 is the 258043-rd centered octagonal number.

It is an amenable number.

266343727225 is a deficient number, since it is larger than the sum of its proper divisors (63925694292).

266343727225 is an frugal number, since it uses more digits than its factorization.

266343727225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206444 (or 103222 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 49.

Multiplying 266343727225 by its sum of digits (49), we get a square (13050842634025 = 3612595²).

The spelling of 266343727225 in words is "two hundred sixty-six billion, three hundred forty-three million, seven hundred twenty-seven thousand, two hundred twenty-five".