261161835136 has 32 divisors (see below), whose sum is σ = 547666682400. Its totient is φ = 123708236544.

The previous prime is 261161835119. The next prime is 261161835173. The reversal of 261161835136 is 631538161162.

261161835136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 261161835092 and 261161835101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53690380 + ... + 53695243.

It is an arithmetic number, because the mean of its divisors is an integer number (17114583825).

Almost surely, 2^261161835136 is an apocalyptic number.

It is an amenable number.

261161835136 is an abundant number, since it is smaller than the sum of its proper divisors (286504847264).

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

261161835136 is a wasteful number, since it uses less digits than its factorization.

261161835136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107385656 (or 107385644 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

Adding to 261161835136 its reverse (631538161162), we get a palindrome (892699996298).

The spelling of 261161835136 in words is "two hundred sixty-one billion, one hundred sixty-one million, eight hundred thirty-five thousand, one hundred thirty-six".