670686811 has 2 divisors, whose sum is σ = 670686812. Its totient is φ = 670686810.

The previous prime is 670686791. The next prime is 670686847. The reversal of 670686811 is 118686076.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 670686811 - 2⁹ = 670686299 is a prime.

It is not a weakly prime, because it can be changed into another prime (670680811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335343405 + 335343406.

It is an arithmetic number, because the mean of its divisors is an integer number (335343406).

Almost surely, 2^670686811 is an apocalyptic number.

670686811 is a deficient number, since it is larger than the sum of its proper divisors (1).

670686811 is an equidigital number, since it uses as much as digits as its factorization.

670686811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 670686811 is about 25897.6217247839. The cubic root of 670686811 is about 875.3329066852.

The spelling of 670686811 in words is "six hundred seventy million, six hundred eighty-six thousand, eight hundred eleven".