261432775043345 has 4 divisors (see below), whose sum is σ = 313719330052020. Its totient is φ = 209146220034672.

The previous prime is 261432775043327. The next prime is 261432775043357. The reversal of 261432775043345 is 543340577234162.

261432775043345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59006010682369 + 202426764360976 = 7681537^2 + 14227676^2 .

It is a cyclic number.

It is not a de Polignac number, because 261432775043345 - 2¹⁴ = 261432775026961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26143277504330 + ... + 26143277504339.

It is an arithmetic number, because the mean of its divisors is an integer number (78429832513005).

Almost surely, 2^{261432775043345} is an apocalyptic number.

It is an amenable number.

261432775043345 is a deficient number, since it is larger than the sum of its proper divisors (52286555008675).

261432775043345 is an equidigital number, since it uses as much as digits as its factorization.

261432775043345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52286555008674.

The product of its (nonzero) digits is 50803200, while the sum is 56.

The spelling of 261432775043345 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, seven hundred seventy-five million, forty-three thousand, three hundred forty-five".