266342401 has 4 divisors (see below), whose sum is σ = 286830292. Its totient is φ = 245854512.

The previous prime is 266342393. The next prime is 266342411. The reversal of 266342401 is 104243662.

It is a Cunningham number, because it is equal to 16320²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39388176 + 226954225 = 6276^2 + 15065^2 .

It is a cyclic number.

It is not a de Polignac number, because 266342401 - 2³ = 266342393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266342401.

It is not an unprimeable number, because it can be changed into a prime (266342411) 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, 10243926 + ... + 10243951.

It is an arithmetic number, because the mean of its divisors is an integer number (71707573).

Almost surely, 2^266342401 is an apocalyptic number.

It is an amenable number.

266342401 is a deficient number, since it is larger than the sum of its proper divisors (20487891).

266342401 is a wasteful number, since it uses less digits than its factorization.

266342401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20487890.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 266342401 is about 16320.0000306373. Note that the first 4 decimals coincide. The cubic root of 266342401 is about 643.3985880337.

The spelling of 266342401 in words is "two hundred sixty-six million, three hundred forty-two thousand, four hundred one".