682780661 has 2 divisors, whose sum is σ = 682780662. Its totient is φ = 682780660.

The previous prime is 682780621. The next prime is 682780663. The reversal of 682780661 is 166087286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660747025 + 22033636 = 25705^2 + 4694^2 .

It is a cyclic number.

It is not a de Polignac number, because 682780661 - 2¹⁰ = 682779637 is a prime.

Together with 682780663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (682780663) 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, 341390330 + 341390331.

It is an arithmetic number, because the mean of its divisors is an integer number (341390331).

Almost surely, 2^682780661 is an apocalyptic number.

It is an amenable number.

682780661 is a deficient number, since it is larger than the sum of its proper divisors (1).

682780661 is an equidigital number, since it uses as much as digits as its factorization.

682780661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 682780661 is about 26130.0719669885. The cubic root of 682780661 is about 880.5629408571.

The spelling of 682780661 in words is "six hundred eighty-two million, seven hundred eighty thousand, six hundred sixty-one".