266000005 has 8 divisors (see below), whose sum is σ = 326985624. Its totient is φ = 207609600.

The previous prime is 265999961. The next prime is 266000017. The reversal of 266000005 is 500000662.

It can be written as a sum of positive squares in 4 ways, for example, as 23824161 + 242175844 = 4881^2 + 15562^2 .

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

It is not a de Polignac number, because 266000005 - 2¹⁵ = 265967237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648576 + ... + 648985.

It is an arithmetic number, because the mean of its divisors is an integer number (40873203).

Almost surely, 2^266000005 is an apocalyptic number.

It is an amenable number.

266000005 is a deficient number, since it is larger than the sum of its proper divisors (60985619).

266000005 is a wasteful number, since it uses less digits than its factorization.

266000005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297607.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 266000005 is about 16309.5065835849. The cubic root of 266000005 is about 643.1227631676.

Adding to 266000005 its reverse (500000662), we get a palindrome (766000667).

The spelling of 266000005 in words is "two hundred sixty-six million, five", and thus it is an aban number.