647631065077 has 2 divisors, whose sum is σ = 647631065078. Its totient is φ = 647631065076.

The previous prime is 647631065071. The next prime is 647631065099. The reversal of 647631065077 is 770560136746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 623861442801 + 23769622276 = 789849^2 + 154174^2 .

It is a cyclic number.

It is not a de Polignac number, because 647631065077 - 2¹⁹ = 647630540789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647631065071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323815532538 + 323815532539.

It is an arithmetic number, because the mean of its divisors is an integer number (323815532539).

Almost surely, 2^647631065077 is an apocalyptic number.

It is an amenable number.

647631065077 is a deficient number, since it is larger than the sum of its proper divisors (1).

647631065077 is an equidigital number, since it uses as much as digits as its factorization.

647631065077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4445280, while the sum is 52.

The spelling of 647631065077 in words is "six hundred forty-seven billion, six hundred thirty-one million, sixty-five thousand, seventy-seven".