680661323 has 2 divisors, whose sum is σ = 680661324. Its totient is φ = 680661322.

The previous prime is 680661277. The next prime is 680661329. The reversal of 680661323 is 323166086.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680661323 - 2⁶ = 680661259 is a prime.

It is a super-2 number, since 2×680661323² = 926599673256220658, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (680661329) 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 as a sum of consecutive naturals, namely, 340330661 + 340330662.

It is an arithmetic number, because the mean of its divisors is an integer number (340330662).

Almost surely, 2^680661323 is an apocalyptic number.

680661323 is a deficient number, since it is larger than the sum of its proper divisors (1).

680661323 is an equidigital number, since it uses as much as digits as its factorization.

680661323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 680661323 is about 26089.4868289892. The cubic root of 680661323 is about 879.6509131060.

The spelling of 680661323 in words is "six hundred eighty million, six hundred sixty-one thousand, three hundred twenty-three".