266563016261 has 8 divisors (see below), whose sum is σ = 267254448384. Its totient is φ = 265872075120.

The previous prime is 266563016249. The next prime is 266563016297. The reversal of 266563016261 is 162610365662.

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

It is a cyclic number.

It is not a de Polignac number, because 266563016261 - 2¹⁴ = 266562999877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266563013261) by changing a digit.

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, 977240 + ... + 1219886.

It is an arithmetic number, because the mean of its divisors is an integer number (33406806048).

Almost surely, 2^266563016261 is an apocalyptic number.

It is an amenable number.

266563016261 is a deficient number, since it is larger than the sum of its proper divisors (691432123).

266563016261 is a wasteful number, since it uses less digits than its factorization.

266563016261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245491.

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 266563016261 in words is "two hundred sixty-six billion, five hundred sixty-three million, sixteen thousand, two hundred sixty-one".