647706476477 has 2 divisors, whose sum is σ = 647706476478. Its totient is φ = 647706476476.

The previous prime is 647706476471. The next prime is 647706476597. The reversal of 647706476477 is 774674607746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 627698091076 + 20008385401 = 792274^2 + 141451^2 .

It is a cyclic number.

It is not a de Polignac number, because 647706476477 - 2³⁶ = 578986999741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647706476471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323853238238 + 323853238239.

It is an arithmetic number, because the mean of its divisors is an integer number (323853238239).

Almost surely, 2^647706476477 is an apocalyptic number.

It is an amenable number.

647706476477 is a deficient number, since it is larger than the sum of its proper divisors (1).

647706476477 is an equidigital number, since it uses as much as digits as its factorization.

647706476477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 232339968, while the sum is 65.

The spelling of 647706476477 in words is "six hundred forty-seven billion, seven hundred six million, four hundred seventy-six thousand, four hundred seventy-seven".