680740140668 has 36 divisors (see below), whose sum is σ = 1386185419080. Its totient is φ = 291663040032.

The previous prime is 680740140667. The next prime is 680740140671. The reversal of 680740140668 is 866041047086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680740140667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202946 + ... + 1184342.

It is an arithmetic number, because the mean of its divisors is an integer number (38505150530).

Almost surely, 2^680740140668 is an apocalyptic number.

It is an amenable number.

680740140668 is an abundant number, since it is smaller than the sum of its proper divisors (705445278412).

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

680740140668 is a wasteful number, since it uses less digits than its factorization.

680740140668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984954 (or 984945 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 680740140668 in words is "six hundred eighty billion, seven hundred forty million, one hundred forty thousand, six hundred sixty-eight".