65165720 has 32 divisors (see below), whose sum is σ = 151355520. Its totient is φ = 25224960.

The previous prime is 65165719. The next prime is 65165747. The reversal of 65165720 is 2756156.

It is a happy number.

65165720 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 7 ways as a sum of consecutive naturals, for example, 25037 + ... + 27516.

It is an arithmetic number, because the mean of its divisors is an integer number (4729860).

Almost surely, 2^65165720 is an apocalyptic number.

It is an amenable number.

65165720 is an abundant number, since it is smaller than the sum of its proper divisors (86189800).

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

65165720 is a wasteful number, since it uses less digits than its factorization.

65165720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52595 (or 52591 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 65165720 is about 8072.5287240121. The cubic root of 65165720 is about 402.4139857094.

The spelling of 65165720 in words is "sixty-five million, one hundred sixty-five thousand, seven hundred twenty".