680661331 has 8 divisors (see below), whose sum is σ = 780130400. Its totient is φ = 581750208.

The previous prime is 680661329. The next prime is 680661343. The reversal of 680661331 is 133166086.

It is a happy number.

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 680661331 - 2¹ = 680661329 is a prime.

It is a super-2 number, since 2×680661331² = 926599695037383122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680661031) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 136866 + ... + 141751.

It is an arithmetic number, because the mean of its divisors is an integer number (97516300).

Almost surely, 2^680661331 is an apocalyptic number.

680661331 is a deficient number, since it is larger than the sum of its proper divisors (99469069).

680661331 is a wasteful number, since it uses less digits than its factorization.

680661331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278973.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 680661331 is about 26089.4869823076. The cubic root of 680661331 is about 879.6509165522.

The spelling of 680661331 in words is "six hundred eighty million, six hundred sixty-one thousand, three hundred thirty-one".