646559955608 has 128 divisors (see below), whose sum is σ = 1428223104000. Its totient is φ = 268715543040.

The previous prime is 646559955583. The next prime is 646559955611. The reversal of 646559955608 is 806559955646.

It is a super-3 number, since 3×646559955608³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60235010 + ... + 60245742.

It is an arithmetic number, because the mean of its divisors is an integer number (11157993000).

Almost surely, 2^646559955608 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 646559955608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714111552000).

646559955608 is an abundant number, since it is smaller than the sum of its proper divisors (781663148392).

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

646559955608 is a wasteful number, since it uses less digits than its factorization.

646559955608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11065 (or 11061 counting only the distinct ones).

The product of its (nonzero) digits is 349920000, while the sum is 68.

The spelling of 646559955608 in words is "six hundred forty-six billion, five hundred fifty-nine million, nine hundred fifty-five thousand, six hundred eight".