266252609 has 16 divisors (see below), whose sum is σ = 307405056. Its totient is φ = 225892800.

The previous prime is 266252593. The next prime is 266252633. The reversal of 266252609 is 906252662.

It is a happy number.

It is not a de Polignac number, because 266252609 - 2⁴ = 266252593 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (266252639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 491879 + ... + 492419.

It is an arithmetic number, because the mean of its divisors is an integer number (19212816).

Almost surely, 2^266252609 is an apocalyptic number.

It is an amenable number.

266252609 is a deficient number, since it is larger than the sum of its proper divisors (41152447).

266252609 is a wasteful number, since it uses less digits than its factorization.

266252609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 266252609 is about 16317.2488183517. The cubic root of 266252609 is about 643.3262769293.

The spelling of 266252609 in words is "two hundred sixty-six million, two hundred fifty-two thousand, six hundred nine".