641769677 has 2 divisors, whose sum is σ = 641769678. Its totient is φ = 641769676.

The previous prime is 641769673. The next prime is 641769691. The reversal of 641769677 is 776967146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 444956836 + 196812841 = 21094^2 + 14029^2 .

It is a cyclic number.

It is not a de Polignac number, because 641769677 - 2² = 641769673 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641769673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320884838 + 320884839.

It is an arithmetic number, because the mean of its divisors is an integer number (320884839).

Almost surely, 2^641769677 is an apocalyptic number.

It is an amenable number.

641769677 is a deficient number, since it is larger than the sum of its proper divisors (1).

641769677 is an equidigital number, since it uses as much as digits as its factorization.

641769677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2667168, while the sum is 53.

The square root of 641769677 is about 25333.1734490569. The cubic root of 641769677 is about 862.5674478375.

The spelling of 641769677 in words is "six hundred forty-one million, seven hundred sixty-nine thousand, six hundred seventy-seven".