647564643853 has 2 divisors, whose sum is σ = 647564643854. Its totient is φ = 647564643852.

The previous prime is 647564643851. The next prime is 647564643899. The reversal of 647564643853 is 358346465746.

647564643853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 446226672004 + 201337971849 = 668002^2 + 448707^2 .

It is a cyclic number.

It is not a de Polignac number, because 647564643853 - 2¹ = 647564643851 is a prime.

Together with 647564643851, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 647564643791 and 647564643800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647564643851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323782321926 + 323782321927.

It is an arithmetic number, because the mean of its divisors is an integer number (323782321927).

Almost surely, 2^647564643853 is an apocalyptic number.

It is an amenable number.

647564643853 is a deficient number, since it is larger than the sum of its proper divisors (1).

647564643853 is an equidigital number, since it uses as much as digits as its factorization.

647564643853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174182400, while the sum is 61.

The spelling of 647564643853 in words is "six hundred forty-seven billion, five hundred sixty-four million, six hundred forty-three thousand, eight hundred fifty-three".