261805520706 has 32 divisors (see below), whose sum is σ = 529966922688. Its totient is φ = 86209381440.

The previous prime is 261805520663. The next prime is 261805520729. The reversal of 261805520706 is 607025508162.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9179340 + ... + 9207816.

It is an arithmetic number, because the mean of its divisors is an integer number (16561466334).

Almost surely, 2^261805520706 is an apocalyptic number.

261805520706 is an abundant number, since it is smaller than the sum of its proper divisors (268161401982).

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

261805520706 is a wasteful number, since it uses less digits than its factorization.

261805520706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47026.

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 261805520706 in words is "two hundred sixty-one billion, eight hundred five million, five hundred twenty thousand, seven hundred six".