646067843 has 2 divisors, whose sum is σ = 646067844. Its totient is φ = 646067842.

The previous prime is 646067839. The next prime is 646067857. The reversal of 646067843 is 348760646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 646067843 - 2² = 646067839 is a prime.

It is equal to p_33599618 and since 646067843 and 33599618 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 646067794 and 646067803.

It is not a weakly prime, because it can be changed into another prime (646067803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323033921 + 323033922.

It is an arithmetic number, because the mean of its divisors is an integer number (323033922).

Almost surely, 2^646067843 is an apocalyptic number.

646067843 is a deficient number, since it is larger than the sum of its proper divisors (1).

646067843 is an equidigital number, since it uses as much as digits as its factorization.

646067843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 44.

The square root of 646067843 is about 25417.8646428059. The cubic root of 646067843 is about 864.4888079634.

The spelling of 646067843 in words is "six hundred forty-six million, sixty-seven thousand, eight hundred forty-three".