680966081 has 4 divisors (see below), whose sum is σ = 704447700. Its totient is φ = 657484464.

The previous prime is 680966071. The next prime is 680966087. The reversal of 680966081 is 180669086.

680966081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 237653056 + 443313025 = 15416^2 + 21055^2 .

It is a cyclic number.

It is not a de Polignac number, because 680966081 - 2²⁶ = 613857217 is a prime.

It is a super-2 number, since 2×680966081² = 927429606944997122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680966087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11740766 + ... + 11740823.

It is an arithmetic number, because the mean of its divisors is an integer number (176111925).

Almost surely, 2^680966081 is an apocalyptic number.

It is an amenable number.

680966081 is a deficient number, since it is larger than the sum of its proper divisors (23481619).

680966081 is a wasteful number, since it uses less digits than its factorization.

680966081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23481618.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 680966081 is about 26095.3268038551. The cubic root of 680966081 is about 879.7821779234.

The spelling of 680966081 in words is "six hundred eighty million, nine hundred sixty-six thousand, eighty-one".