261771610643371 has 8 divisors (see below), whose sum is σ = 268698281417280. Its totient is φ = 254901484121088.

The previous prime is 261771610643351. The next prime is 261771610643393. The reversal of 261771610643371 is 173346016177162.

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 261771610643371 - 2¹⁵ = 261771610610603 is a prime.

It is a super-2 number, since 2×261771610643371² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261771610643321) 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, 14136053526 + ... + 14136072043.

It is an arithmetic number, because the mean of its divisors is an integer number (33587285177160).

Almost surely, 2^{261771610643371} is an apocalyptic number.

261771610643371 is a deficient number, since it is larger than the sum of its proper divisors (6926670773909).

261771610643371 is a wasteful number, since it uses less digits than its factorization.

261771610643371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28272125813.

The product of its (nonzero) digits is 5334336, while the sum is 55.

The spelling of 261771610643371 in words is "two hundred sixty-one trillion, seven hundred seventy-one billion, six hundred ten million, six hundred forty-three thousand, three hundred seventy-one".