261266633 has 4 divisors (see below), whose sum is σ = 261401028. Its totient is φ = 261132240.

The previous prime is 261266623. The next prime is 261266639. The reversal of 261266633 is 336662162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 336662162 = 2 ⋅168331081.

It can be written as a sum of positive squares in 2 ways, for example, as 32410249 + 228856384 = 5693^2 + 15128^2 .

It is a cyclic number.

It is not a de Polignac number, because 261266633 - 2⁴ = 261266617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261266593 and 261266602.

It is not an unprimeable number, because it can be changed into a prime (261266639) 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, 64238 + ... + 68183.

It is an arithmetic number, because the mean of its divisors is an integer number (65350257).

Almost surely, 2^261266633 is an apocalyptic number.

It is an amenable number.

261266633 is a deficient number, since it is larger than the sum of its proper divisors (134395).

261266633 is a wasteful number, since it uses less digits than its factorization.

261266633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134394.

The product of its digits is 46656, while the sum is 35.

The square root of 261266633 is about 16163.7443991174. The cubic root of 261266633 is about 639.2851988600.

The spelling of 261266633 in words is "two hundred sixty-one million, two hundred sixty-six thousand, six hundred thirty-three".