261290473816 has 16 divisors (see below), whose sum is σ = 490258236240. Its totient is φ = 130554944160.

The previous prime is 261290473813. The next prime is 261290473861. The reversal of 261290473816 is 618374092162.

It is a happy number.

261290473816 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261290473816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261290473811) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11274295 + ... + 11297446.

It is an arithmetic number, because the mean of its divisors is an integer number (30641139765).

Almost surely, 2^261290473816 is an apocalyptic number.

It is an amenable number.

261290473816 is a deficient number, since it is larger than the sum of its proper divisors (228967762424).

261290473816 is a wasteful number, since it uses less digits than its factorization.

261290473816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22573194 (or 22573190 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 261290473816 in words is "two hundred sixty-one billion, two hundred ninety million, four hundred seventy-three thousand, eight hundred sixteen".