648980669 has 2 divisors, whose sum is σ = 648980670. Its totient is φ = 648980668.

The previous prime is 648980617. The next prime is 648980687. The reversal of 648980669 is 966089846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 647448025 + 1532644 = 25445^2 + 1238^2 .

It is a cyclic number.

It is not a de Polignac number, because 648980669 - 2²⁰ = 647932093 is a prime.

It is a super-2 number, since 2×648980669² = 842351817471375122, 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 (648980069) 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, 324490334 + 324490335.

It is an arithmetic number, because the mean of its divisors is an integer number (324490335).

Almost surely, 2^648980669 is an apocalyptic number.

It is an amenable number.

648980669 is a deficient number, since it is larger than the sum of its proper divisors (1).

648980669 is an equidigital number, since it uses as much as digits as its factorization.

648980669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The square root of 648980669 is about 25475.0989988263. The cubic root of 648980669 is about 865.7860559348.

The spelling of 648980669 in words is "six hundred forty-eight million, nine hundred eighty thousand, six hundred sixty-nine".