266342399 has 8 divisors (see below), whose sum is σ = 280704000. Its totient is φ = 252015192.

The previous prime is 266342393. The next prime is 266342411. The reversal of 266342399 is 993243662.

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

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 266342399 - 2⁸ = 266342143 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266342393) 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 7 ways as a sum of consecutive naturals, for example, 8162 + ... + 24480.

It is an arithmetic number, because the mean of its divisors is an integer number (35088000).

Almost surely, 2^266342399 is an apocalyptic number.

266342399 is a deficient number, since it is larger than the sum of its proper divisors (14361601).

266342399 is a wasteful number, since it uses less digits than its factorization.

266342399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17197.

The product of its digits is 419904, while the sum is 44.

The square root of 266342399 is about 16319.9999693627. Note that the first 4 decimals coincide. The cubic root of 266342399 is about 643.3985864232.

The spelling of 266342399 in words is "two hundred sixty-six million, three hundred forty-two thousand, three hundred ninety-nine".