671776069 has 2 divisors, whose sum is σ = 671776070. Its totient is φ = 671776068.

The previous prime is 671776051. The next prime is 671776093. The reversal of 671776069 is 960677176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578402500 + 93373569 = 24050^2 + 9663^2 .

It is a cyclic number.

It is not a de Polignac number, because 671776069 - 2¹¹ = 671774021 is a prime.

It is a super-3 number, since 3×671776069³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671776009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335888034 + 335888035.

It is an arithmetic number, because the mean of its divisors is an integer number (335888035).

Almost surely, 2^671776069 is an apocalyptic number.

It is an amenable number.

671776069 is a deficient number, since it is larger than the sum of its proper divisors (1).

671776069 is an equidigital number, since it uses as much as digits as its factorization.

671776069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 666792, while the sum is 49.

The square root of 671776069 is about 25918.6432708196. The cubic root of 671776069 is about 875.8065244999.

The spelling of 671776069 in words is "six hundred seventy-one million, seven hundred seventy-six thousand, sixty-nine".