647795669 has 2 divisors, whose sum is σ = 647795670. Its totient is φ = 647795668.

The previous prime is 647795657. The next prime is 647795677. The reversal of 647795669 is 966597746.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518700625 + 129095044 = 22775^2 + 11362^2 .

It is a cyclic number.

It is not a de Polignac number, because 647795669 - 2⁸ = 647795413 is a prime.

It is a super-2 number, since 2×647795669² = 839278457550315122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647795639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323897834 + 323897835.

It is an arithmetic number, because the mean of its divisors is an integer number (323897835).

Almost surely, 2^647795669 is an apocalyptic number.

It is an amenable number.

647795669 is a deficient number, since it is larger than the sum of its proper divisors (1).

647795669 is an equidigital number, since it uses as much as digits as its factorization.

647795669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 59.

The square root of 647795669 is about 25451.8303664000. The cubic root of 647795669 is about 865.2587769753.

The spelling of 647795669 in words is "six hundred forty-seven million, seven hundred ninety-five thousand, six hundred sixty-nine".