641063677 has 2 divisors, whose sum is σ = 641063678. Its totient is φ = 641063676.

The previous prime is 641063669. The next prime is 641063699. The reversal of 641063677 is 776360146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499120281 + 141943396 = 22341^2 + 11914^2 .

It is a cyclic number.

It is not a de Polignac number, because 641063677 - 2³ = 641063669 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641060677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320531838 + 320531839.

It is an arithmetic number, because the mean of its divisors is an integer number (320531839).

Almost surely, 2^641063677 is an apocalyptic number.

It is an amenable number.

641063677 is a deficient number, since it is larger than the sum of its proper divisors (1).

641063677 is an equidigital number, since it uses as much as digits as its factorization.

641063677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 641063677 is about 25319.2353162571. The cubic root of 641063677 is about 862.2510331468.

The spelling of 641063677 in words is "six hundred forty-one million, sixty-three thousand, six hundred seventy-seven".