647676658669 has 2 divisors, whose sum is σ = 647676658670. Its totient is φ = 647676658668.

The previous prime is 647676658663. The next prime is 647676658679. The reversal of 647676658669 is 966856676746.

647676658669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646986966025 + 689692644 = 804355^2 + 26262^2 .

It is a cyclic number.

It is not a de Polignac number, because 647676658669 - 2⁹ = 647676658157 is a prime.

It is a super-2 number, since 2×647676658669² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 647676658595 and 647676658604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647676658663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323838329334 + 323838329335.

It is an arithmetic number, because the mean of its divisors is an integer number (323838329335).

Almost surely, 2^647676658669 is an apocalyptic number.

It is an amenable number.

647676658669 is a deficient number, since it is larger than the sum of its proper divisors (1).

647676658669 is an equidigital number, since it uses as much as digits as its factorization.

647676658669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3292047360, while the sum is 76.

The spelling of 647676658669 in words is "six hundred forty-seven billion, six hundred seventy-six million, six hundred fifty-eight thousand, six hundred sixty-nine".