261684116 has 24 divisors (see below), whose sum is σ = 467507040. Its totient is φ = 128128032.

The previous prime is 261684053. The next prime is 261684121. The reversal of 261684116 is 611486162.

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 7 ways as a sum of consecutive naturals, for example, 63371 + ... + 67373.

It is an arithmetic number, because the mean of its divisors is an integer number (19479460).

Almost surely, 2^261684116 is an apocalyptic number.

It is an amenable number.

261684116 is a deficient number, since it is larger than the sum of its proper divisors (205822924).

261684116 is a wasteful number, since it uses less digits than its factorization.

261684116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4343 (or 4341 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 261684116 is about 16176.6534239935. The cubic root of 261684116 is about 639.6255263753.

The spelling of 261684116 in words is "two hundred sixty-one million, six hundred eighty-four thousand, one hundred sixteen".