65685564 has 72 divisors (see below), whose sum is σ = 190645728. Its totient is φ = 18679680.

The previous prime is 65685541. The next prime is 65685583. The reversal of 65685564 is 46558656.

It is a happy number.

65685564 is a `hidden beast` number, since 6 + 5 + 6 + 85 + 564 = 666.

65685564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69334 + ... + 70274.

Almost surely, 2^65685564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65685564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95322864).

65685564 is an abundant number, since it is smaller than the sum of its proper divisors (124960164).

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

65685564 is a wasteful number, since it uses less digits than its factorization.

65685564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1230 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 65685564 is about 8104.6631021900. The cubic root of 65685564 is about 403.4812067734.

The spelling of 65685564 in words is "sixty-five million, six hundred eighty-five thousand, five hundred sixty-four".