646680523606 has 12 divisors (see below), whose sum is σ = 1050377537412. Its totient is φ = 298467933816.

The previous prime is 646680523597. The next prime is 646680523631. The reversal of 646680523606 is 606325086646.

It is a super-2 number, since 2×646680523606² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 956627656 + ... + 956628331.

It is an arithmetic number, because the mean of its divisors is an integer number (87531461451).

Almost surely, 2^646680523606 is an apocalyptic number.

646680523606 is a deficient number, since it is larger than the sum of its proper divisors (403697013806).

646680523606 is a wasteful number, since it uses less digits than its factorization.

646680523606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913256015 (or 1913256002 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 646680523606 in words is "six hundred forty-six billion, six hundred eighty million, five hundred twenty-three thousand, six hundred six".