266161771 has 4 divisors (see below), whose sum is σ = 266704344. Its totient is φ = 265619200.

The previous prime is 266161769. The next prime is 266161859. The reversal of 266161771 is 177161662.

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

It is a cyclic number.

It is not a de Polignac number, because 266161771 - 2¹ = 266161769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266161771.

It is not an unprimeable number, because it can be changed into a prime (266161171) 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, 270550 + ... + 271531.

It is an arithmetic number, because the mean of its divisors is an integer number (66676086).

Almost surely, 2^266161771 is an apocalyptic number.

266161771 is a deficient number, since it is larger than the sum of its proper divisors (542573).

266161771 is an equidigital number, since it uses as much as digits as its factorization.

266161771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542572.

The product of its digits is 21168, while the sum is 37.

The square root of 266161771 is about 16314.4650847032. The cubic root of 266161771 is about 643.2531069177.

The spelling of 266161771 in words is "two hundred sixty-six million, one hundred sixty-one thousand, seven hundred seventy-one".