261380751856 has 40 divisors (see below), whose sum is σ = 582005070720. Its totient is φ = 111394501824.

The previous prime is 261380751803. The next prime is 261380751913. The reversal of 261380751856 is 658157083162.

261380751856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 6498826 + ... + 6538921.

It is an arithmetic number, because the mean of its divisors is an integer number (14550126768).

Almost surely, 2^261380751856 is an apocalyptic number.

It is an amenable number.

261380751856 is an abundant number, since it is smaller than the sum of its proper divisors (320624318864).

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

261380751856 is a wasteful number, since it uses less digits than its factorization.

261380751856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13037941 (or 13037935 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 261380751856 in words is "two hundred sixty-one billion, three hundred eighty million, seven hundred fifty-one thousand, eight hundred fifty-six".