646559099883648 has 128 divisors (see below), whose sum is σ = 2180854106832000. Its totient is φ = 184731171388416.

The previous prime is 646559099883611. The next prime is 646559099883731. The reversal of 646559099883648 is 846388990955646.

646559099883648 is a `hidden beast` number, since 6 + 4 + 6 + 5 + 590 + 9 + 9 + 8 + 8 + 3 + 6 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×646559099883648² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13363052443 + ... + 13363100826.

It is an arithmetic number, because the mean of its divisors is an integer number (17037922709625).

Almost surely, 2^{646559099883648} is an apocalyptic number.

It is an amenable number.

646559099883648 is an abundant number, since it is smaller than the sum of its proper divisors (1534295006948352).

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

646559099883648 is a wasteful number, since it uses less digits than its factorization.

646559099883648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26726153299 (or 26726153281 counting only the distinct ones).

The product of its (nonzero) digits is 96745881600, while the sum is 90.

The spelling of 646559099883648 in words is "six hundred forty-six trillion, five hundred fifty-nine billion, ninety-nine million, eight hundred eighty-three thousand, six hundred forty-eight".