646477200665287 has 2 divisors, whose sum is σ = 646477200665288. Its totient is φ = 646477200665286.

The previous prime is 646477200665221. The next prime is 646477200665311. The reversal of 646477200665287 is 782566002774646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646477200665287 - 2¹⁹ = 646477200140999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646477200365287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323238600332643 + 323238600332644.

It is an arithmetic number, because the mean of its divisors is an integer number (323238600332644).

Almost surely, 2^{646477200665287} is an apocalyptic number.

646477200665287 is a deficient number, since it is larger than the sum of its proper divisors (1).

646477200665287 is an equidigital number, since it uses as much as digits as its factorization.

646477200665287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1137991680, while the sum is 70.

The spelling of 646477200665287 in words is "six hundred forty-six trillion, four hundred seventy-seven billion, two hundred million, six hundred sixty-five thousand, two hundred eighty-seven".