261055810830 has 16 divisors (see below), whose sum is σ = 626533946064. Its totient is φ = 69614882880.

The previous prime is 261055810817. The next prime is 261055810849. The reversal of 261055810830 is 38018550162.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4350930151 + ... + 4350930210.

It is an arithmetic number, because the mean of its divisors is an integer number (39158371629).

Almost surely, 2^261055810830 is an apocalyptic number.

261055810830 is an abundant number, since it is smaller than the sum of its proper divisors (365478135234).

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

261055810830 is a wasteful number, since it uses less digits than its factorization.

261055810830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8701860371.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 261055810830 in words is "two hundred sixty-one billion, fifty-five million, eight hundred ten thousand, eight hundred thirty".