68681340006660 has 60 divisors (see below), whose sum is σ = 215455907359308. Its totient is φ = 18315024001344.

The previous prime is 68681340006647. The next prime is 68681340006679. The reversal of 68681340006660 is 6660004318686.

It can be written as a sum of positive squares in 2 ways, for example, as 38590037319744 + 30091302686916 = 6212088^2 + 5485554^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×68681340006660² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 68681340006597 and 68681340006606.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21197942827 + ... + 21197946066.

Almost surely, 2^{68681340006660} is an apocalyptic number.

68681340006660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68681340006660 is an abundant number, since it is smaller than the sum of its proper divisors (146774567352648).

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

68681340006660 is a wasteful number, since it uses less digits than its factorization.

68681340006660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42395888914 (or 42395888903 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 68681340006660 in words is "sixty-eight trillion, six hundred eighty-one billion, three hundred forty million, six thousand, six hundred sixty".