667680681 has 8 divisors (see below), whose sum is σ = 890398080. Its totient is φ = 445041872.

The previous prime is 667680679. The next prime is 667680707. The reversal of 667680681 is 186086766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667680681 - 2¹ = 667680679 is a prime.

It is a super-2 number, since 2×667680681² = 891594983561247522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667680681.

It is not an unprimeable number, because it can be changed into a prime (667680631) 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, 4375 + ... + 36803.

It is an arithmetic number, because the mean of its divisors is an integer number (111299760).

Almost surely, 2^667680681 is an apocalyptic number.

It is an amenable number.

667680681 is a deficient number, since it is larger than the sum of its proper divisors (222717399).

667680681 is a wasteful number, since it uses less digits than its factorization.

667680681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39295.

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 667680681 is about 25839.5178167086. The cubic root of 667680681 is about 874.0231519228.

The spelling of 667680681 in words is "six hundred sixty-seven million, six hundred eighty thousand, six hundred eighty-one".