261487678196 has 12 divisors (see below), whose sum is σ = 459065430852. Its totient is φ = 130326126528.

The previous prime is 261487678169. The next prime is 261487678219. The reversal of 261487678196 is 691876784162.

It can be written as a sum of positive squares in 2 ways, for example, as 2443324900 + 259044353296 = 49430^2 + 508964^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104426735 + ... + 104429238.

It is an arithmetic number, because the mean of its divisors is an integer number (38255452571).

Almost surely, 2^261487678196 is an apocalyptic number.

It is an amenable number.

261487678196 is a deficient number, since it is larger than the sum of its proper divisors (197577752656).

261487678196 is a wasteful number, since it uses less digits than its factorization.

261487678196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208856290 (or 208856288 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 65.

The spelling of 261487678196 in words is "two hundred sixty-one billion, four hundred eighty-seven million, six hundred seventy-eight thousand, one hundred ninety-six".