647564643799 has 8 divisors (see below), whose sum is σ = 675733276800. Its totient is φ = 619397148216.

The previous prime is 647564643757. The next prime is 647564643809. The reversal of 647564643799 is 997346465746.

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

It is not a de Polignac number, because 647564643799 - 2¹¹ = 647564641751 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 (647564643499) 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, 1003152 + ... + 1517050.

It is an arithmetic number, because the mean of its divisors is an integer number (84466659600).

Almost surely, 2^647564643799 is an apocalyptic number.

647564643799 is a deficient number, since it is larger than the sum of its proper divisors (28168633001).

647564643799 is a wasteful number, since it uses less digits than its factorization.

647564643799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568709.

The product of its digits is 823011840, while the sum is 70.

The spelling of 647564643799 in words is "six hundred forty-seven billion, five hundred sixty-four million, six hundred forty-three thousand, seven hundred ninety-nine".