261512501530 has 32 divisors (see below), whose sum is σ = 566282712960. Its totient is φ = 84942406080.

The previous prime is 261512501507. The next prime is 261512501531. The reversal of 261512501530 is 35105215162.

261512501530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261512501492 and 261512501501.

It is not an unprimeable number, because it can be changed into a prime (261512501531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98311641 + ... + 98314300.

It is an arithmetic number, because the mean of its divisors is an integer number (17696334780).

Almost surely, 2^261512501530 is an apocalyptic number.

261512501530 is an abundant number, since it is smaller than the sum of its proper divisors (304770211430).

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

261512501530 is a wasteful number, since it uses less digits than its factorization.

261512501530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196625974.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 261512501530 its reverse (35105215162), we get a palindrome (296617716692).

The spelling of 261512501530 in words is "two hundred sixty-one billion, five hundred twelve million, five hundred one thousand, five hundred thirty".