680661329 has 2 divisors, whose sum is σ = 680661330. Its totient is φ = 680661328.

The previous prime is 680661323. The next prime is 680661343. The reversal of 680661329 is 923166086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572501329 + 108160000 = 23927^2 + 10400^2 .

It is a cyclic number.

It is not a de Polignac number, because 680661329 - 2²⁴ = 663884113 is a prime.

It is not a weakly prime, because it can be changed into another prime (680661323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340330664 + 340330665.

It is an arithmetic number, because the mean of its divisors is an integer number (340330665).

Almost surely, 2^680661329 is an apocalyptic number.

It is an amenable number.

680661329 is a deficient number, since it is larger than the sum of its proper divisors (1).

680661329 is an equidigital number, since it uses as much as digits as its factorization.

680661329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 680661329 is about 26089.4869439780. The cubic root of 680661329 is about 879.6509156907.

The spelling of 680661329 in words is "six hundred eighty million, six hundred sixty-one thousand, three hundred twenty-nine".