261451537122271 has 6 divisors (see below), whose sum is σ = 277735715905280. Its totient is φ = 246072034938336.

The previous prime is 261451537122161. The next prime is 261451537122289. The reversal of 261451537122271 is 172221735154162.

It is not a de Polignac number, because 261451537122271 - 2¹¹ = 261451537120223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261491537122271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 452338299231 + ... + 452338299808.

Almost surely, 2^{261451537122271} is an apocalyptic number.

261451537122271 is a deficient number, since it is larger than the sum of its proper divisors (16284178783009).

261451537122271 is an equidigital number, since it uses as much as digits as its factorization.

261451537122271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904676599073 (or 904676599056 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 49.

The spelling of 261451537122271 in words is "two hundred sixty-one trillion, four hundred fifty-one billion, five hundred thirty-seven million, one hundred twenty-two thousand, two hundred seventy-one".