266250013 has 4 divisors (see below), whose sum is σ = 267240060. Its totient is φ = 265259968.

The previous prime is 266249993. The next prime is 266250043. The reversal of 266250013 is 310052662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310052662 = 2 ⋅155026331.

It can be written as a sum of positive squares in 2 ways, for example, as 72539289 + 193710724 = 8517^2 + 13918^2 .

It is a cyclic number.

It is not a de Polignac number, because 266250013 - 2⁵ = 266249981 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 266250013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266250043) 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 3 ways as a sum of consecutive naturals, for example, 494620 + ... + 495157.

It is an arithmetic number, because the mean of its divisors is an integer number (66810015).

Almost surely, 2^266250013 is an apocalyptic number.

It is an amenable number.

266250013 is a deficient number, since it is larger than the sum of its proper divisors (990047).

266250013 is an equidigital number, since it uses as much as digits as its factorization.

266250013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990046.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 266250013 is about 16317.1692704341. The cubic root of 266250013 is about 643.3241860822.

The spelling of 266250013 in words is "two hundred sixty-six million, two hundred fifty thousand, thirteen".