261613706752 has 40 divisors (see below), whose sum is σ = 525636837000. Its totient is φ = 130076043264.

The previous prime is 261613706743. The next prime is 261613706801. The reversal of 261613706752 is 257607316162.

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, 1335627 + ... + 1518922.

It is an arithmetic number, because the mean of its divisors is an integer number (13140920925).

Almost surely, 2^261613706752 is an apocalyptic number.

It is an amenable number.

261613706752 is an abundant number, since it is smaller than the sum of its proper divisors (264023130248).

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

261613706752 is an equidigital number, since it uses as much as digits as its factorization.

261613706752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854746 (or 2854730 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 46.

The spelling of 261613706752 in words is "two hundred sixty-one billion, six hundred thirteen million, seven hundred six thousand, seven hundred fifty-two".