261566870828 has 24 divisors (see below), whose sum is σ = 483956356800. Its totient is φ = 123354273168.

The previous prime is 261566870767. The next prime is 261566870839. The reversal of 261566870828 is 828078665162.

It is a happy number.

261566870828 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7563518 + ... + 7598021.

It is an arithmetic number, because the mean of its divisors is an integer number (20164848200).

Almost surely, 2^261566870828 is an apocalyptic number.

It is an amenable number.

261566870828 is a deficient number, since it is larger than the sum of its proper divisors (222389485972).

261566870828 is a wasteful number, since it uses less digits than its factorization.

261566870828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15161789 (or 15161787 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 59.

The spelling of 261566870828 in words is "two hundred sixty-one billion, five hundred sixty-six million, eight hundred seventy thousand, eight hundred twenty-eight".