261366522 has 16 divisors (see below), whose sum is σ = 527530080. Its totient is φ = 86322672.

The previous prime is 261366509. The next prime is 261366533. The reversal of 261366522 is 225663162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199168 + ... + 200475.

It is an arithmetic number, because the mean of its divisors is an integer number (32970630).

Almost surely, 2^261366522 is an apocalyptic number.

261366522 is an abundant number, since it is smaller than the sum of its proper divisors (266163558).

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

261366522 is a wasteful number, since it uses less digits than its factorization.

261366522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399757.

The product of its digits is 25920, while the sum is 33.

The square root of 261366522 is about 16166.8340128796. The cubic root of 261366522 is about 639.3666602418.

The spelling of 261366522 in words is "two hundred sixty-one million, three hundred sixty-six thousand, five hundred twenty-two".