266066257 has 4 divisors (see below), whose sum is σ = 266701680. Its totient is φ = 265430836.

The previous prime is 266066249. The next prime is 266066263. The reversal of 266066257 is 752660662.

It is a happy number.

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 266066257 - 2³ = 266066249 is a prime.

It is a super-2 number, since 2×266066257² = 141582506227980098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266066267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317083 + ... + 317920.

It is an arithmetic number, because the mean of its divisors is an integer number (66675420).

Almost surely, 2^266066257 is an apocalyptic number.

It is an amenable number.

266066257 is a deficient number, since it is larger than the sum of its proper divisors (635423).

266066257 is an equidigital number, since it uses as much as digits as its factorization.

266066257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635422.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 266066257 is about 16311.5375424881. The cubic root of 266066257 is about 643.1761524302.

The spelling of 266066257 in words is "two hundred sixty-six million, sixty-six thousand, two hundred fifty-seven".