266489669 has 2 divisors, whose sum is σ = 266489670. Its totient is φ = 266489668.

The previous prime is 266489623. The next prime is 266489693. The reversal of 266489669 is 966984662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137780644 + 128709025 = 11738^2 + 11345^2 .

It is a cyclic number.

It is not a de Polignac number, because 266489669 - 2¹² = 266485573 is a prime.

It is a super-2 number, since 2×266489669² = 142033487367459122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266489969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133244834 + 133244835.

It is an arithmetic number, because the mean of its divisors is an integer number (133244835).

Almost surely, 2^266489669 is an apocalyptic number.

It is an amenable number.

266489669 is a deficient number, since it is larger than the sum of its proper divisors (1).

266489669 is an equidigital number, since it uses as much as digits as its factorization.

266489669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 56.

The square root of 266489669 is about 16324.5112943696. The cubic root of 266489669 is about 643.5171504113.

The spelling of 266489669 in words is "two hundred sixty-six million, four hundred eighty-nine thousand, six hundred sixty-nine".