647647655563 has 8 divisors (see below), whose sum is σ = 648774901808. Its totient is φ = 646521074784.

The previous prime is 647647655549. The next prime is 647647655579. The reversal of 647647655563 is 365556746746.

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 647647655563 - 2⁹ = 647647655051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647647655495 and 647647655504.

It is not an unprimeable number, because it can be changed into a prime (647647655503) 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, 1801981 + ... + 2131297.

It is an arithmetic number, because the mean of its divisors is an integer number (81096862726).

Almost surely, 2^647647655563 is an apocalyptic number.

647647655563 is a deficient number, since it is larger than the sum of its proper divisors (1127246245).

647647655563 is a wasteful number, since it uses less digits than its factorization.

647647655563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332733.

The product of its digits is 381024000, while the sum is 64.

The spelling of 647647655563 in words is "six hundred forty-seven billion, six hundred forty-seven million, six hundred fifty-five thousand, five hundred sixty-three".