647650109791 has 8 divisors (see below), whose sum is σ = 652076490240. Its totient is φ = 643229254872.

The previous prime is 647650109767. The next prime is 647650109819. The reversal of 647650109791 is 197901056746.

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 647650109791 - 2⁵ = 647650109759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647650103791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1146025 + ... + 1615138.

It is an arithmetic number, because the mean of its divisors is an integer number (81509561280).

Almost surely, 2^647650109791 is an apocalyptic number.

647650109791 is a deficient number, since it is larger than the sum of its proper divisors (4426380449).

647650109791 is a wasteful number, since it uses less digits than its factorization.

647650109791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2762765.

The product of its (nonzero) digits is 2857680, while the sum is 55.

The spelling of 647650109791 in words is "six hundred forty-seven billion, six hundred fifty million, one hundred nine thousand, seven hundred ninety-one".