647241656517 has 12 divisors (see below), whose sum is σ = 984110121280. Its totient is φ = 408784204008.

The previous prime is 647241656513. The next prime is 647241656561. The reversal of 647241656517 is 715656142746.

647241656517 is a `hidden beast` number, since 6 + 4 + 72 + 4 + 1 + 6 + 56 + 517 = 666.

It is not a de Polignac number, because 647241656517 - 2² = 647241656513 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 (647241656513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1892519293 + ... + 1892519634.

Almost surely, 2^647241656517 is an apocalyptic number.

It is an amenable number.

647241656517 is a deficient number, since it is larger than the sum of its proper divisors (336868464763).

647241656517 is a wasteful number, since it uses less digits than its factorization.

647241656517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785038952 (or 3785038949 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 647241656517 in words is "six hundred forty-seven billion, two hundred forty-one million, six hundred fifty-six thousand, five hundred seventeen".