647996065 has 4 divisors (see below), whose sum is σ = 777595284. Its totient is φ = 518396848.

The previous prime is 647996051. The next prime is 647996081. The reversal of 647996065 is 560699746.

647996065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182817441 + 465178624 = 13521^2 + 21568^2 .

It is a cyclic number.

It is not a de Polignac number, because 647996065 - 2⁹ = 647995553 is a prime.

It is a Duffinian 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, 64799602 + ... + 64799611.

It is an arithmetic number, because the mean of its divisors is an integer number (194398821).

Almost surely, 2^647996065 is an apocalyptic number.

It is an amenable number.

647996065 is a deficient number, since it is larger than the sum of its proper divisors (129599219).

647996065 is a wasteful number, since it uses less digits than its factorization.

647996065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129599218.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The square root of 647996065 is about 25455.7668318988. The cubic root of 647996065 is about 865.3479905599.

The spelling of 647996065 in words is "six hundred forty-seven million, nine hundred ninety-six thousand, sixty-five".