647109609285 has 32 divisors (see below), whose sum is σ = 1050436437120. Its totient is φ = 340141022208.

The previous prime is 647109609247. The next prime is 647109609287. The reversal of 647109609285 is 582906901746.

647109609285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647109609285 - 2⁹ = 647109608773 is a prime.

It is a super-2 number, since 2×647109609285² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647109609287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 847072 + ... + 1418361.

It is an arithmetic number, because the mean of its divisors is an integer number (32826138660).

Almost surely, 2^647109609285 is an apocalyptic number.

It is an amenable number.

647109609285 is a deficient number, since it is larger than the sum of its proper divisors (403326827835).

647109609285 is a wasteful number, since it uses less digits than its factorization.

647109609285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265717.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 647109609285 in words is "six hundred forty-seven billion, one hundred nine million, six hundred nine thousand, two hundred eighty-five".