266623013 has 4 divisors (see below), whose sum is σ = 275816940. Its totient is φ = 257429088.

The previous prime is 266623001. The next prime is 266623039. The reversal of 266623013 is 310326662.

266623013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310326662 = 2 ⋅155163331.

It can be written as a sum of positive squares in 2 ways, for example, as 48972004 + 217651009 = 6998^2 + 14753^2 .

It is a cyclic number.

It is not a de Polignac number, because 266623013 - 2⁴ = 266622997 is a prime.

It is a super-2 number, since 2×266623013² = 142175662122396338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 9193897 = 266623013 / (2 + 6 + 6 + 6 + 2 + 3 + 0 + 1 + 3).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266623043) 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, 4596920 + ... + 4596977.

It is an arithmetic number, because the mean of its divisors is an integer number (68954235).

Almost surely, 2^266623013 is an apocalyptic number.

It is an amenable number.

266623013 is a deficient number, since it is larger than the sum of its proper divisors (9193927).

266623013 is an equidigital number, since it uses as much as digits as its factorization.

266623013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9193926.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 266623013 is about 16328.5949487395. The cubic root of 266623013 is about 643.6244651939.

Adding to 266623013 its reverse (310326662), we get a palindrome (576949675).

The spelling of 266623013 in words is "two hundred sixty-six million, six hundred twenty-three thousand, thirteen".