68140881680 has 40 divisors (see below), whose sum is σ = 158483921112. Its totient is φ = 27246654464.

The previous prime is 68140881673. The next prime is 68140881701. The reversal of 68140881680 is 8618804186.

It can be written as a sum of positive squares in 4 ways, for example, as 8294109184 + 59846772496 = 91072^2 + 244636^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×68140881680² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76844 + ... + 377076.

Almost surely, 2^68140881680 is an apocalyptic number.

It is an amenable number.

68140881680 is an abundant number, since it is smaller than the sum of its proper divisors (90343039432).

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

68140881680 is a wasteful number, since it uses less digits than its factorization.

68140881680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303083 (or 303077 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 50.

The spelling of 68140881680 in words is "sixty-eight billion, one hundred forty million, eight hundred eighty-one thousand, six hundred eighty".