65665026 has 128 divisors (see below), whose sum is σ = 180633600. Its totient is φ = 17262720.

The previous prime is 65665013. The next prime is 65665031. The reversal of 65665026 is 62056656.

65665026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon 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 63 ways as a sum of consecutive naturals, for example, 294351 + ... + 294573.

It is an arithmetic number, because the mean of its divisors is an integer number (1411200).

Almost surely, 2^65665026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65665026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90316800).

65665026 is an abundant number, since it is smaller than the sum of its proper divisors (114968574).

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

65665026 is a wasteful number, since it uses less digits than its factorization.

65665026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 65665026 is about 8103.3959547834. The cubic root of 65665026 is about 403.4391500396.

The spelling of 65665026 in words is "sixty-five million, six hundred sixty-five thousand, twenty-six".