65065721 has 8 divisors (see below), whose sum is σ = 76370880. Its totient is φ = 54263088.

The previous prime is 65065717. The next prime is 65065727. The reversal of 65065721 is 12756056.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 65065721 - 2² = 65065717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65065727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125351 + ... + 125868.

It is an arithmetic number, because the mean of its divisors is an integer number (9546360).

Almost surely, 2^65065721 is an apocalyptic number.

It is an amenable number.

65065721 is a deficient number, since it is larger than the sum of its proper divisors (11305159).

65065721 is a wasteful number, since it uses less digits than its factorization.

65065721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251263.

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

The square root of 65065721 is about 8066.3325619516. The cubic root of 65065721 is about 402.2080410428.

The spelling of 65065721 in words is "sixty-five million, sixty-five thousand, seven hundred twenty-one".