647193065 has 4 divisors (see below), whose sum is σ = 776631684. Its totient is φ = 517754448.

The previous prime is 647193047. The next prime is 647193073. The reversal of 647193065 is 560391746.

647193065 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 120582361 + 526610704 = 10981^2 + 22948^2 .

It is a cyclic number.

It is not a de Polignac number, because 647193065 - 2⁸ = 647192809 is a prime.

It is a Duffinian number.

It is a Curzon 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, 64719302 + ... + 64719311.

It is an arithmetic number, because the mean of its divisors is an integer number (194157921).

Almost surely, 2^647193065 is an apocalyptic number.

It is an amenable number.

647193065 is a deficient number, since it is larger than the sum of its proper divisors (129438619).

647193065 is a wasteful number, since it uses less digits than its factorization.

647193065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129438618.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 647193065 is about 25439.9894850607. The cubic root of 647193065 is about 864.9903949394.

The spelling of 647193065 in words is "six hundred forty-seven million, one hundred ninety-three thousand, sixty-five".