243775266261 has 8 divisors (see below), whose sum is σ = 325124165760. Its totient is φ = 162471605472.

The previous prime is 243775266223. The next prime is 243775266263. The reversal of 243775266261 is 162662577342.

243775266261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 243775266261 - 2²⁶ = 243708157397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243775266263) 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 7 ways as a sum of consecutive naturals, for example, 11297101 + ... + 11318658.

It is an arithmetic number, because the mean of its divisors is an integer number (40640520720).

Almost surely, 2^243775266261 is an apocalyptic number.

It is an amenable number.

243775266261 is a deficient number, since it is larger than the sum of its proper divisors (81348899499).

243775266261 is a wasteful number, since it uses less digits than its factorization.

243775266261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22619355.

The product of its digits is 5080320, while the sum is 51.

The spelling of 243775266261 in words is "two hundred forty-three billion, seven hundred seventy-five million, two hundred sixty-six thousand, two hundred sixty-one".