680849668 has 6 divisors (see below), whose sum is σ = 1191486926. Its totient is φ = 340424832.

The previous prime is 680849641. The next prime is 680849699. The reversal of 680849668 is 866948086.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 634636864 + 46212804 = 25192^2 + 6798^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85106205 + ... + 85106212.

Almost surely, 2^680849668 is an apocalyptic number.

It is an amenable number.

680849668 is a deficient number, since it is larger than the sum of its proper divisors (510637258).

680849668 is a wasteful number, since it uses less digits than its factorization.

680849668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170212421 (or 170212419 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 55.

The square root of 680849668 is about 26093.0961750422. The cubic root of 680849668 is about 879.7320413492.

The spelling of 680849668 in words is "six hundred eighty million, eight hundred forty-nine thousand, six hundred sixty-eight".