261466616 has 16 divisors (see below), whose sum is σ = 496456800. Its totient is φ = 129078144.

The previous prime is 261466607. The next prime is 261466631. The reversal of 261466616 is 616664162.

It is a self number, because there is not a number n which added to its sum of digits gives 261466616.

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, 206225 + ... + 207488.

It is an arithmetic number, because the mean of its divisors is an integer number (31028550).

Almost surely, 2^261466616 is an apocalyptic number.

It is an amenable number.

261466616 is a deficient number, since it is larger than the sum of its proper divisors (234990184).

261466616 is a wasteful number, since it uses less digits than its factorization.

261466616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413798 (or 413794 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 261466616 is about 16169.9293752323. The cubic root of 261466616 is about 639.4482679884.

The spelling of 261466616 in words is "two hundred sixty-one million, four hundred sixty-six thousand, six hundred sixteen".