266666389 has 8 divisors (see below), whose sum is σ = 291055968. Its totient is φ = 242301360.

The previous prime is 266666381. The next prime is 266666443. The reversal of 266666389 is 983666662.

It is a happy number.

266666389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266666389 - 2³ = 266666381 is a prime.

It is a super-2 number, since 2×266666389² = 142221926044598642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266666381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22354 + ... + 32140.

It is an arithmetic number, because the mean of its divisors is an integer number (36381996).

Almost surely, 2^266666389 is an apocalyptic number.

It is an amenable number.

266666389 is a deficient number, since it is larger than the sum of its proper divisors (24389579).

266666389 is a wasteful number, since it uses less digits than its factorization.

266666389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12275.

The product of its digits is 3359232, while the sum is 52.

The square root of 266666389 is about 16329.9231167817. The cubic root of 266666389 is about 643.6593663335.

The spelling of 266666389 in words is "two hundred sixty-six million, six hundred sixty-six thousand, three hundred eighty-nine".