680159609 has 2 divisors, whose sum is σ = 680159610. Its totient is φ = 680159608.

The previous prime is 680159593. The next prime is 680159621. The reversal of 680159609 is 906951086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643738384 + 36421225 = 25372^2 + 6035^2 .

It is a cyclic number.

It is not a de Polignac number, because 680159609 - 2⁴ = 680159593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680159609.

It is not a weakly prime, because it can be changed into another prime (680159629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340079804 + 340079805.

It is an arithmetic number, because the mean of its divisors is an integer number (340079805).

Almost surely, 2^680159609 is an apocalyptic number.

It is an amenable number.

680159609 is a deficient number, since it is larger than the sum of its proper divisors (1).

680159609 is an equidigital number, since it uses as much as digits as its factorization.

680159609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 680159609 is about 26079.8698041229. The cubic root of 680159609 is about 879.4347303814.

The spelling of 680159609 in words is "six hundred eighty million, one hundred fifty-nine thousand, six hundred nine".