646887788683 has 2 divisors, whose sum is σ = 646887788684. Its totient is φ = 646887788682.

The previous prime is 646887788669. The next prime is 646887788689. The reversal of 646887788683 is 386887788646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646887788683 is a prime.

It is a super-2 number, since 2×646887788683² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (646887788689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323443894341 + 323443894342.

It is an arithmetic number, because the mean of its divisors is an integer number (323443894342).

Almost surely, 2^646887788683 is an apocalyptic number.

646887788683 is a deficient number, since it is larger than the sum of its proper divisors (1).

646887788683 is an equidigital number, since it uses as much as digits as its factorization.

646887788683 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4161798144, while the sum is 79.

The spelling of 646887788683 in words is "six hundred forty-six billion, eight hundred eighty-seven million, seven hundred eighty-eight thousand, six hundred eighty-three".