266034166225 has 27 divisors (see below), whose sum is σ = 337873299483. Its totient is φ = 207791208240.

The previous prime is 266034166193. The next prime is 266034166243. The reversal of 266034166225 is 522661430662.

The square root of 266034166225 is 515785.

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., 95772299841 + 170261866384 = 309471^2 + 412628^2 .

It is not a de Polignac number, because 266034166225 - 2⁵ = 266034166193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 110892576 + ... + 110894974.

Almost surely, 2^266034166225 is an apocalyptic number.

266034166225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

266034166225 is the 515785-th square number.

266034166225 is the 257893-rd centered octagonal number.

It is an amenable number.

266034166225 is a deficient number, since it is larger than the sum of its proper divisors (71839133258).

266034166225 is an frugal number, since it uses more digits than its factorization.

266034166225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4894 (or 2447 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 43.

Adding to 266034166225 its reverse (522661430662), we get a palindrome (788695596887).

The spelling of 266034166225 in words is "two hundred sixty-six billion, thirty-four million, one hundred sixty-six thousand, two hundred twenty-five".