670950809 has 2 divisors, whose sum is σ = 670950810. Its totient is φ = 670950808.

The previous prime is 670950793. The next prime is 670950821. The reversal of 670950809 is 908059076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 459888025 + 211062784 = 21445^2 + 14528^2 .

It is a cyclic number.

It is not a de Polignac number, because 670950809 - 2⁴ = 670950793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 670950809.

It is not a weakly prime, because it can be changed into another prime (670950209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335475404 + 335475405.

It is an arithmetic number, because the mean of its divisors is an integer number (335475405).

Almost surely, 2^670950809 is an apocalyptic number.

It is an amenable number.

670950809 is a deficient number, since it is larger than the sum of its proper divisors (1).

670950809 is an equidigital number, since it uses as much as digits as its factorization.

670950809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 670950809 is about 25902.7181778284. The cubic root of 670950809 is about 875.4477421142.

The spelling of 670950809 in words is "six hundred seventy million, nine hundred fifty thousand, eight hundred nine".