68066086640 has 20 divisors (see below), whose sum is σ = 158253651624. Its totient is φ = 27226434624.

The previous prime is 68066086597. The next prime is 68066086651. The reversal of 68066086640 is 4668066086.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 425412962 + ... + 425413121.

Almost surely, 2^68066086640 is an apocalyptic number.

It is an amenable number.

68066086640 is an abundant number, since it is smaller than the sum of its proper divisors (90187564984).

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

68066086640 is a wasteful number, since it uses less digits than its factorization.

68066086640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850826096 (or 850826090 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 68066086640 in words is "sixty-eight billion, sixty-six million, eighty-six thousand, six hundred forty".