266166749 has 4 divisors (see below), whose sum is σ = 267017436. Its totient is φ = 265316064.

The previous prime is 266166743. The next prime is 266166757. The reversal of 266166749 is 947661662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 138815524 + 127351225 = 11782^2 + 11285^2 .

It is a cyclic number.

It is not a de Polignac number, because 266166749 - 2¹² = 266162653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266166743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424874 + ... + 425499.

It is an arithmetic number, because the mean of its divisors is an integer number (66754359).

Almost surely, 2^266166749 is an apocalyptic number.

It is an amenable number.

266166749 is a deficient number, since it is larger than the sum of its proper divisors (850687).

266166749 is an equidigital number, since it uses as much as digits as its factorization.

266166749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850686.

The product of its digits is 653184, while the sum is 47.

The square root of 266166749 is about 16314.6176479867. The cubic root of 266166749 is about 643.2571171280.

The spelling of 266166749 in words is "two hundred sixty-six million, one hundred sixty-six thousand, seven hundred forty-nine".