680161778801 has 2 divisors, whose sum is σ = 680161778802. Its totient is φ = 680161778800.

The previous prime is 680161778767. The next prime is 680161778827. The reversal of 680161778801 is 108877161086.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551425056400 + 128736722401 = 742580^2 + 358799^2 .

It is a cyclic number.

It is not a de Polignac number, because 680161778801 - 2¹⁴ = 680161762417 is a prime.

It is not a weakly prime, because it can be changed into another prime (680161708801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340080889400 + 340080889401.

It is an arithmetic number, because the mean of its divisors is an integer number (340080889401).

Almost surely, 2^680161778801 is an apocalyptic number.

It is an amenable number.

680161778801 is a deficient number, since it is larger than the sum of its proper divisors (1).

680161778801 is an equidigital number, since it uses as much as digits as its factorization.

680161778801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 53.

The spelling of 680161778801 in words is "six hundred eighty billion, one hundred sixty-one million, seven hundred seventy-eight thousand, eight hundred one".