646061556605 has 8 divisors (see below), whose sum is σ = 780408132864. Its totient is φ = 513426402000.

The previous prime is 646061556601. The next prime is 646061556653. The reversal of 646061556605 is 506655160646.

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

It is not a de Polignac number, because 646061556605 - 2² = 646061556601 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 (646061556601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427854581 + ... + 427856090.

It is an arithmetic number, because the mean of its divisors is an integer number (97551016608).

Almost surely, 2^646061556605 is an apocalyptic number.

It is an amenable number.

646061556605 is a deficient number, since it is larger than the sum of its proper divisors (134346576259).

646061556605 is a wasteful number, since it uses less digits than its factorization.

646061556605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855710827.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 646061556605 in words is "six hundred forty-six billion, sixty-one million, five hundred fifty-six thousand, six hundred five".