261523305522 has 96 divisors (see below), whose sum is σ = 605404800000. Its totient is φ = 81409829760.

The previous prime is 261523305509. The next prime is 261523305581. The reversal of 261523305522 is 225503325162.

261523305522 is a `hidden beast` number, since 2 + 61 + 523 + 3 + 0 + 55 + 22 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44481379 + ... + 44487257.

It is an arithmetic number, because the mean of its divisors is an integer number (6306300000).

Almost surely, 2^261523305522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261523305522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302702400000).

261523305522 is an abundant number, since it is smaller than the sum of its proper divisors (343881494478).

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

261523305522 is a wasteful number, since it uses less digits than its factorization.

261523305522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8696 (or 8693 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The spelling of 261523305522 in words is "two hundred sixty-one billion, five hundred twenty-three million, three hundred five thousand, five hundred twenty-two".