646270649 has 2 divisors, whose sum is σ = 646270650. Its totient is φ = 646270648.

The previous prime is 646270643. The next prime is 646270673. The reversal of 646270649 is 946072646.

646270649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646176400 + 94249 = 25420^2 + 307^2 .

It is a cyclic number.

It is not a de Polignac number, because 646270649 - 2¹² = 646266553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646270643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323135324 + 323135325.

It is an arithmetic number, because the mean of its divisors is an integer number (323135325).

Almost surely, 2^646270649 is an apocalyptic number.

It is an amenable number.

646270649 is a deficient number, since it is larger than the sum of its proper divisors (1).

646270649 is an equidigital number, since it uses as much as digits as its factorization.

646270649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 646270649 is about 25421.8537679690. The cubic root of 646270649 is about 864.5792552114.

The spelling of 646270649 in words is "six hundred forty-six million, two hundred seventy thousand, six hundred forty-nine".