680161778827 has 2 divisors, whose sum is σ = 680161778828. Its totient is φ = 680161778826.

The previous prime is 680161778801. The next prime is 680161778869. The reversal of 680161778827 is 728877161086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680161778827 - 2¹¹ = 680161776779 is a prime.

It is not a weakly prime, because it can be changed into another prime (680161778227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340080889413 + 340080889414.

It is an arithmetic number, because the mean of its divisors is an integer number (340080889414).

Almost surely, 2^680161778827 is an apocalyptic number.

680161778827 is a deficient number, since it is larger than the sum of its proper divisors (1).

680161778827 is an equidigital number, since it uses as much as digits as its factorization.

680161778827 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12644352, while the sum is 61.

The spelling of 680161778827 in words is "six hundred eighty billion, one hundred sixty-one million, seven hundred seventy-eight thousand, eight hundred twenty-seven".