261630730424 has 32 divisors (see below), whose sum is σ = 560657877120. Its totient is φ = 112123336416.

The previous prime is 261630730397. The next prime is 261630730447. The reversal of 261630730424 is 424037036162.

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, 1830827 + ... + 1968549.

It is an arithmetic number, because the mean of its divisors is an integer number (17520558660).

Almost surely, 2^261630730424 is an apocalyptic number.

It is an amenable number.

261630730424 is an abundant number, since it is smaller than the sum of its proper divisors (299027146696).

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

261630730424 is a wasteful number, since it uses less digits than its factorization.

261630730424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171659 (or 171655 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 38.

Adding to 261630730424 its reverse (424037036162), we get a palindrome (685667766586).

The spelling of 261630730424 in words is "two hundred sixty-one billion, six hundred thirty million, seven hundred thirty thousand, four hundred twenty-four".