261802590056 has 16 divisors (see below), whose sum is σ = 561005550240. Its totient is φ = 112201110000.

The previous prime is 261802590029. The next prime is 261802590073. The reversal of 261802590056 is 650095208162.

It is a junction number, because it is equal to n+sod(n) for n = 261802589989 and 261802590016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2337523070 + ... + 2337523181.

It is an arithmetic number, because the mean of its divisors is an integer number (35062846890).

Almost surely, 2^261802590056 is an apocalyptic number.

It is an amenable number.

261802590056 is an abundant number, since it is smaller than the sum of its proper divisors (299202960184).

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

261802590056 is a wasteful number, since it uses less digits than its factorization.

261802590056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4675046264 (or 4675046260 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 261802590056 in words is "two hundred sixty-one billion, eight hundred two million, five hundred ninety thousand, fifty-six".