261704634168 has 32 divisors (see below), whose sum is σ = 654301244160. Its totient is φ = 87229590240.

The previous prime is 261704634167. The next prime is 261704634187. The reversal of 261704634168 is 861436407162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261704634161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84321 + ... + 728367.

It is an arithmetic number, because the mean of its divisors is an integer number (20446913880).

Almost surely, 2^261704634168 is an apocalyptic number.

It is an amenable number.

261704634168 is an abundant number, since it is smaller than the sum of its proper divisors (392596609992).

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

261704634168 is a wasteful number, since it uses less digits than its factorization.

261704634168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660987 (or 660983 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 261704634168 in words is "two hundred sixty-one billion, seven hundred four million, six hundred thirty-four thousand, one hundred sixty-eight".