261686622 has 8 divisors (see below), whose sum is σ = 523373256. Its totient is φ = 87228872.

The previous prime is 261686591. The next prime is 261686651. The reversal of 261686622 is 226686162.

It is a sphenic number, since it is the product of 3 distinct primes.

261686622 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21807213 + ... + 21807224.

It is an arithmetic number, because the mean of its divisors is an integer number (65421657).

Almost surely, 2^261686622 is an apocalyptic number.

261686622 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261686622 is a wasteful number, since it uses less digits than its factorization.

261686622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43614442.

The product of its digits is 82944, while the sum is 39.

The square root of 261686622 is about 16176.7308811144. The cubic root of 261686622 is about 639.6275681454.

The spelling of 261686622 in words is "two hundred sixty-one million, six hundred eighty-six thousand, six hundred twenty-two".