680366851 has 4 divisors (see below), whose sum is σ = 684441072. Its totient is φ = 676292632.

The previous prime is 680366837. The next prime is 680366857. The reversal of 680366851 is 158663086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158663086 = 2 ⋅79331543.

It is a cyclic number.

It is not a de Polignac number, because 680366851 - 2¹⁷ = 680235779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 680366798 and 680366807.

It is not an unprimeable number, because it can be changed into a prime (680366857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036860 + ... + 2037193.

It is an arithmetic number, because the mean of its divisors is an integer number (171110268).

Almost surely, 2^680366851 is an apocalyptic number.

680366851 is a deficient number, since it is larger than the sum of its proper divisors (4074221).

680366851 is a wasteful number, since it uses less digits than its factorization.

680366851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074220.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 680366851 is about 26083.8427192007. The cubic root of 680366851 is about 879.5240414305.

The spelling of 680366851 in words is "six hundred eighty million, three hundred sixty-six thousand, eight hundred fifty-one".