647771243347 has 2 divisors, whose sum is σ = 647771243348. Its totient is φ = 647771243346.

The previous prime is 647771243321. The next prime is 647771243359. The reversal of 647771243347 is 743342177746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647771243347 - 2²⁷ = 647637025619 is a prime.

It is not a weakly prime, because it can be changed into another prime (647771243377) 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, 323885621673 + 323885621674.

It is an arithmetic number, because the mean of its divisors is an integer number (323885621674).

Almost surely, 2^647771243347 is an apocalyptic number.

647771243347 is a deficient number, since it is larger than the sum of its proper divisors (1).

647771243347 is an equidigital number, since it uses as much as digits as its factorization.

647771243347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16595712, while the sum is 55.

The spelling of 647771243347 in words is "six hundred forty-seven billion, seven hundred seventy-one million, two hundred forty-three thousand, three hundred forty-seven".