680205101 has 2 divisors, whose sum is σ = 680205102. Its totient is φ = 680205100.

The previous prime is 680205091. The next prime is 680205107. The reversal of 680205101 is 101502086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450712900 + 229492201 = 21230^2 + 15149^2 .

It is a cyclic number.

It is not a de Polignac number, because 680205101 - 2¹⁸ = 679942957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680205107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340102550 + 340102551.

It is an arithmetic number, because the mean of its divisors is an integer number (340102551).

Almost surely, 2^680205101 is an apocalyptic number.

It is an amenable number.

680205101 is a deficient number, since it is larger than the sum of its proper divisors (1).

680205101 is an equidigital number, since it uses as much as digits as its factorization.

680205101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 680205101 is about 26080.7419564705. The cubic root of 680205101 is about 879.4543367367.

Adding to 680205101 its reverse (101502086), we get a palindrome (781707187).

The spelling of 680205101 in words is "six hundred eighty million, two hundred five thousand, one hundred one".