266228081 has 4 divisors (see below), whose sum is σ = 304260672. Its totient is φ = 228195492.

The previous prime is 266228071. The next prime is 266228089. The reversal of 266228081 is 180822662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180822662 = 2 ⋅90411331.

It is not a de Polignac number, because 266228081 - 2¹⁴ = 266211697 is a prime.

It is a super-2 number, since 2×266228081² = 141754782225885122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266228089) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 19016285 + ... + 19016298.

It is an arithmetic number, because the mean of its divisors is an integer number (76065168).

Almost surely, 2^266228081 is an apocalyptic number.

It is an amenable number.

266228081 is a deficient number, since it is larger than the sum of its proper divisors (38032591).

266228081 is an equidigital number, since it uses as much as digits as its factorization.

266228081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38032590.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 266228081 is about 16316.4972037506. The cubic root of 266228081 is about 643.3065212650.

The spelling of 266228081 in words is "two hundred sixty-six million, two hundred twenty-eight thousand, eighty-one".