261605050136 has 32 divisors (see below), whose sum is σ = 491054406480. Its totient is φ = 130657296000.

The previous prime is 261605050127. The next prime is 261605050151. The reversal of 261605050136 is 631050506162.

It is a junction number, because it is equal to n+sod(n) for n = 261605050096 and 261605050105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53638130 + ... + 53643006.

Almost surely, 2^261605050136 is an apocalyptic number.

It is an amenable number.

261605050136 is a deficient number, since it is larger than the sum of its proper divisors (229449356344).

261605050136 is a wasteful number, since it uses less digits than its factorization.

261605050136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10955 (or 10951 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

Adding to 261605050136 its reverse (631050506162), we get a palindrome (892655556298).

The spelling of 261605050136 in words is "two hundred sixty-one billion, six hundred five million, fifty thousand, one hundred thirty-six".