68449591664 has 40 divisors (see below), whose sum is σ = 137029265280. Its totient is φ = 33089299200.

The previous prime is 68449591643. The next prime is 68449591739. The reversal of 68449591664 is 46619594486.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a junction number, because it is equal to n+sod(n) for n = 68449591597 and 68449591606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461222 + ... + 591290.

It is an arithmetic number, because the mean of its divisors is an integer number (3425731632).

Almost surely, 2^68449591664 is an apocalyptic number.

It is an amenable number.

68449591664 is an abundant number, since it is smaller than the sum of its proper divisors (68579673616).

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

68449591664 is a wasteful number, since it uses less digits than its factorization.

68449591664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131169 (or 131163 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 62.

The spelling of 68449591664 in words is "sixty-eight billion, four hundred forty-nine million, five hundred ninety-one thousand, six hundred sixty-four".