261563402700530 has 32 divisors (see below), whose sum is σ = 546104230125696. Its totient is φ = 88340390164224.

The previous prime is 261563402700529. The next prime is 261563402700533. The reversal of 261563402700530 is 35007204365162.

It is not an unprimeable number, because it can be changed into a prime (261563402700533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27885219479 + ... + 27885228858.

It is an arithmetic number, because the mean of its divisors is an integer number (17065757191428).

Almost surely, 2^{261563402700530} is an apocalyptic number.

261563402700530 is an abundant number, since it is smaller than the sum of its proper divisors (284540827425166).

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

261563402700530 is a wasteful number, since it uses less digits than its factorization.

261563402700530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55770448418.

The product of its (nonzero) digits is 907200, while the sum is 44.

The spelling of 261563402700530 in words is "two hundred sixty-one trillion, five hundred sixty-three billion, four hundred two million, seven hundred thousand, five hundred thirty".