668345017240 has 32 divisors (see below), whose sum is σ = 1505568708000. Its totient is φ = 267019354624.

The previous prime is 668345017237. The next prime is 668345017247. The reversal of 668345017240 is 42710543866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668345017247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9923905 + ... + 9991024.

It is an arithmetic number, because the mean of its divisors is an integer number (47049022125).

Almost surely, 2^668345017240 is an apocalyptic number.

It is an amenable number.

668345017240 is an abundant number, since it is smaller than the sum of its proper divisors (837223690760).

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

668345017240 is a wasteful number, since it uses less digits than its factorization.

668345017240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19915779 (or 19915775 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 668345017240 in words is "six hundred sixty-eight billion, three hundred forty-five million, seventeen thousand, two hundred forty".