647920927061 has 2 divisors, whose sum is σ = 647920927062. Its totient is φ = 647920927060.

The previous prime is 647920927039. The next prime is 647920927097. The reversal of 647920927061 is 160729029746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335205102961 + 312715824100 = 578969^2 + 559210^2 .

It is a cyclic number.

It is not a de Polignac number, because 647920927061 - 2⁶ = 647920926997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 647920926994 and 647920927012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647920927861) 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, 323960463530 + 323960463531.

It is an arithmetic number, because the mean of its divisors is an integer number (323960463531).

Almost surely, 2^647920927061 is an apocalyptic number.

It is an amenable number.

647920927061 is a deficient number, since it is larger than the sum of its proper divisors (1).

647920927061 is an equidigital number, since it uses as much as digits as its factorization.

647920927061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 647920927061 in words is "six hundred forty-seven billion, nine hundred twenty million, nine hundred twenty-seven thousand, sixty-one".