261431265604671 has 6 divisors (see below), whose sum is σ = 377622939206760. Its totient is φ = 174287510403108.

The previous prime is 261431265604631. The next prime is 261431265604681. The reversal of 261431265604671 is 176406562134162.

261431265604671 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 3 + 1 + 2 + 6 + 560 + 4 + 6 + 71 = 666.

It is not a de Polignac number, because 261431265604671 - 2⁴⁶ = 191062521427007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261431265604631) 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, 14523959200251 + ... + 14523959200268.

It is an arithmetic number, because the mean of its divisors is an integer number (62937156534460).

Almost surely, 2^{261431265604671} is an apocalyptic number.

261431265604671 is a deficient number, since it is larger than the sum of its proper divisors (116191673602089).

261431265604671 is a wasteful number, since it uses less digits than its factorization.

261431265604671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29047918400525 (or 29047918400522 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 261431265604671 in words is "two hundred sixty-one trillion, four hundred thirty-one billion, two hundred sixty-five million, six hundred four thousand, six hundred seventy-one".