647178303871793 has 2 divisors, whose sum is σ = 647178303871794. Its totient is φ = 647178303871792.

The previous prime is 647178303871741. The next prime is 647178303871889. The reversal of 647178303871793 is 397178303871746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439142913213169 + 208035390658624 = 20955737^2 + 14423432^2 .

It is a cyclic number.

It is not a de Polignac number, because 647178303871793 - 2²⁶ = 647178236762929 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 647178303871793.

It is not a weakly prime, because it can be changed into another prime (647178303871093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323589151935896 + 323589151935897.

It is an arithmetic number, because the mean of its divisors is an integer number (323589151935897).

Almost surely, 2^{647178303871793} is an apocalyptic number.

It is an amenable number.

647178303871793 is a deficient number, since it is larger than the sum of its proper divisors (1).

647178303871793 is an equidigital number, since it uses as much as digits as its factorization.

647178303871793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896168448, while the sum is 74.

The spelling of 647178303871793 in words is "six hundred forty-seven trillion, one hundred seventy-eight billion, three hundred three million, eight hundred seventy-one thousand, seven hundred ninety-three".