680661868 has 6 divisors (see below), whose sum is σ = 1191158276. Its totient is φ = 340330932.

The previous prime is 680661853. The next prime is 680661889. The reversal of 680661868 is 868166086.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85082730 + ... + 85082737.

Almost surely, 2^680661868 is an apocalyptic number.

It is an amenable number.

680661868 is a deficient number, since it is larger than the sum of its proper divisors (510496408).

680661868 is a wasteful number, since it uses less digits than its factorization.

680661868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170165471 (or 170165469 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 49.

The square root of 680661868 is about 26089.4972738073. The cubic root of 680661868 is about 879.6511478823.

The spelling of 680661868 in words is "six hundred eighty million, six hundred sixty-one thousand, eight hundred sixty-eight".