68686668020 has 48 divisors (see below), whose sum is σ = 145732683600. Its totient is φ = 27190963200.

The previous prime is 68686668007. The next prime is 68686668031. The reversal of 68686668020 is 2086668686.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 33610622224 + 35076045796 = 183332^2 + 187286^2 .

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 5870336 + ... + 5882024.

It is an arithmetic number, because the mean of its divisors is an integer number (3036097575).

Almost surely, 2^68686668020 is an apocalyptic number.

It is an amenable number.

68686668020 is an abundant number, since it is smaller than the sum of its proper divisors (77046015580).

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

68686668020 is a wasteful number, since it uses less digits than its factorization.

68686668020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14708 (or 14706 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 56.

The spelling of 68686668020 in words is "sixty-eight billion, six hundred eighty-six million, six hundred sixty-eight thousand, twenty".