265643505160243 has 16 divisors (see below), whose sum is σ = 319613807296000. Its totient is φ = 215681711012352.

The previous prime is 265643505160213. The next prime is 265643505160247. The reversal of 265643505160243 is 342061505346562.

It is a cyclic number.

It is not a de Polignac number, because 265643505160243 - 2⁹ = 265643505159731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (265643505160247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132354183 + ... + 134346256.

It is an arithmetic number, because the mean of its divisors is an integer number (19975862956000).

Almost surely, 2^{265643505160243} is an apocalyptic number.

265643505160243 is a deficient number, since it is larger than the sum of its proper divisors (53970302135757).

265643505160243 is a wasteful number, since it uses less digits than its factorization.

265643505160243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266707954.

The product of its (nonzero) digits is 15552000, while the sum is 52.

The spelling of 265643505160243 in words is "two hundred sixty-five trillion, six hundred forty-three billion, five hundred five million, one hundred sixty thousand, two hundred forty-three".