68513565648 has 160 divisors (see below), whose sum is σ = 209197181952. Its totient is φ = 19085875200.

The previous prime is 68513565629. The next prime is 68513565671. The reversal of 68513565648 is 84656531586.

It is a super-3 number, since 3×68513565648³ (a number of 33 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, 297213 + ... + 474723.

Almost surely, 2^68513565648 is an apocalyptic number.

68513565648 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68513565648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104598590976).

68513565648 is an abundant number, since it is smaller than the sum of its proper divisors (140683616304).

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

68513565648 is a wasteful number, since it uses less digits than its factorization.

68513565648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177593 (or 177587 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 57.

The spelling of 68513565648 in words is "sixty-eight billion, five hundred thirteen million, five hundred sixty-five thousand, six hundred forty-eight".