646622747 has 2 divisors, whose sum is σ = 646622748. Its totient is φ = 646622746.

The previous prime is 646622719. The next prime is 646622749. The reversal of 646622747 is 747226646.

646622747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646622747 - 2¹⁶ = 646557211 is a prime.

Together with 646622749, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 646622698 and 646622707.

It is not a weakly prime, because it can be changed into another prime (646622749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323311373 + 323311374.

It is an arithmetic number, because the mean of its divisors is an integer number (323311374).

Almost surely, 2^646622747 is an apocalyptic number.

646622747 is a deficient number, since it is larger than the sum of its proper divisors (1).

646622747 is an equidigital number, since it uses as much as digits as its factorization.

646622747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 44.

The square root of 646622747 is about 25428.7779297394. Note that the first 3 decimals coincide. The cubic root of 646622747 is about 864.7362386466.

The spelling of 646622747 in words is "six hundred forty-six million, six hundred twenty-two thousand, seven hundred forty-seven".