680268180017 has 2 divisors, whose sum is σ = 680268180018. Its totient is φ = 680268180016.

The previous prime is 680268180013. The next prime is 680268180091. The reversal of 680268180017 is 710081862086.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448744573456 + 231523606561 = 669884^2 + 481169^2 .

It is a cyclic number.

It is not a de Polignac number, because 680268180017 - 2² = 680268180013 is a prime.

It is not a weakly prime, because it can be changed into another prime (680268180013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340134090008 + 340134090009.

It is an arithmetic number, because the mean of its divisors is an integer number (340134090009).

Almost surely, 2^680268180017 is an apocalyptic number.

It is an amenable number.

680268180017 is a deficient number, since it is larger than the sum of its proper divisors (1).

680268180017 is an equidigital number, since it uses as much as digits as its factorization.

680268180017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 680268180017 in words is "six hundred eighty billion, two hundred sixty-eight million, one hundred eighty thousand, seventeen".