647242305536 has 104 divisors (see below), whose sum is σ = 1339598274504. Its totient is φ = 312465162240.

The previous prime is 647242305533. The next prime is 647242305551. The reversal of 647242305536 is 635503242746.

It can be written as a sum of positive squares in 4 ways, for example, as 81256923136 + 565985382400 = 285056^2 + 752320^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647242305533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16269926 + ... + 16309658.

Almost surely, 2^647242305536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647242305536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (669799137252).

647242305536 is an abundant number, since it is smaller than the sum of its proper divisors (692355968968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647242305536 is an equidigital number, since it uses as much as digits as its factorization.

647242305536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39895 (or 39873 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 47.

The spelling of 647242305536 in words is "six hundred forty-seven billion, two hundred forty-two million, three hundred five thousand, five hundred thirty-six".