261604820224 has 36 divisors (see below), whose sum is σ = 569659366080. Its totient is φ = 118911280640.

The previous prime is 261604820219. The next prime is 261604820249. The reversal of 261604820224 is 422028406162.

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 3 ways as a sum of consecutive naturals, for example, 46446904 + ... + 46452535.

It is an arithmetic number, because the mean of its divisors is an integer number (15823871280).

Almost surely, 2^261604820224 is an apocalyptic number.

It is an amenable number.

261604820224 is an abundant number, since it is smaller than the sum of its proper divisors (308054545856).

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

261604820224 is an equidigital number, since it uses as much as digits as its factorization.

261604820224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92899466 (or 92899452 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 37.

The spelling of 261604820224 in words is "two hundred sixty-one billion, six hundred four million, eight hundred twenty thousand, two hundred twenty-four".