266135989 has 4 divisors (see below), whose sum is σ = 304155424. Its totient is φ = 228116556.

The previous prime is 266135981. The next prime is 266136001. The reversal of 266135989 is 989531662.

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.

It is a cyclic number.

It is not a de Polignac number, because 266135989 - 2³ = 266135981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266135981) 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, 19009707 + ... + 19009720.

It is an arithmetic number, because the mean of its divisors is an integer number (76038856).

Almost surely, 2^266135989 is an apocalyptic number.

It is an amenable number.

266135989 is a deficient number, since it is larger than the sum of its proper divisors (38019435).

266135989 is an equidigital number, since it uses as much as digits as its factorization.

266135989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38019434.

The product of its digits is 699840, while the sum is 49.

The square root of 266135989 is about 16313.6749078802. The cubic root of 266135989 is about 643.2323364829.

The spelling of 266135989 in words is "two hundred sixty-six million, one hundred thirty-five thousand, nine hundred eighty-nine".