261171716886 has 12 divisors (see below), whose sum is σ = 565872053292. Its totient is φ = 87057238956.

The previous prime is 261171716881. The next prime is 261171716921. The reversal of 261171716886 is 688617171162.

261171716886 is a `hidden beast` number, since 2 + 611 + 7 + 1 + 7 + 16 + 8 + 8 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261171716881) 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, 7254769896 + ... + 7254769931.

It is an arithmetic number, because the mean of its divisors is an integer number (47156004441).

Almost surely, 2^261171716886 is an apocalyptic number.

261171716886 is an abundant number, since it is smaller than the sum of its proper divisors (304700336406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261171716886 is a wasteful number, since it uses less digits than its factorization.

261171716886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14509539835 (or 14509539832 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The spelling of 261171716886 in words is "two hundred sixty-one billion, one hundred seventy-one million, seven hundred sixteen thousand, eight hundred eighty-six".