261552510041271 has 8 divisors (see below), whose sum is σ = 350957932794864. Its totient is φ = 173257713657600.

The previous prime is 261552510041243. The next prime is 261552510041293. The reversal of 261552510041271 is 172140015255162.

It is a happy number.

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

It is not a de Polignac number, because 261552510041271 - 2²⁵ = 261552476486839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261552510045271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277656591930 + ... + 277656592871.

It is an arithmetic number, because the mean of its divisors is an integer number (43869741599358).

Almost surely, 2^{261552510041271} is an apocalyptic number.

261552510041271 is a deficient number, since it is larger than the sum of its proper divisors (89405422753593).

261552510041271 is a wasteful number, since it uses less digits than its factorization.

261552510041271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555313184961.

The product of its (nonzero) digits is 168000, while the sum is 42.

The spelling of 261552510041271 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, five hundred ten million, forty-one thousand, two hundred seventy-one".