646622699 has 2 divisors, whose sum is σ = 646622700. Its totient is φ = 646622698.

The previous prime is 646622671. The next prime is 646622701. The reversal of 646622699 is 996226646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646622699 is a prime.

It is a super-3 number, since 3×646622699³ (a number of 27 digits) contains 333 as substring.

Together with 646622701, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646622399) 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, 323311349 + 323311350.

It is an arithmetic number, because the mean of its divisors is an integer number (323311350).

Almost surely, 2^646622699 is an apocalyptic number.

646622699 is a deficient number, since it is larger than the sum of its proper divisors (1).

646622699 is an equidigital number, since it uses as much as digits as its factorization.

646622699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 50.

The square root of 646622699 is about 25428.7769859268. The cubic root of 646622699 is about 864.7362172496.

The spelling of 646622699 in words is "six hundred forty-six million, six hundred twenty-two thousand, six hundred ninety-nine".