1640304833 has 2 divisors, whose sum is σ = 1640304834. Its totient is φ = 1640304832.

The previous prime is 1640304803. The next prime is 1640304871. The reversal of 1640304833 is 3384030461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 832437904 + 807866929 = 28852^2 + 28423^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640304833 - 2⁸ = 1640304577 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640304833.

It is not a weakly prime, because it can be changed into another prime (1640304803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820152416 + 820152417.

It is an arithmetic number, because the mean of its divisors is an integer number (820152417).

Almost surely, 2^1640304833 is an apocalyptic number.

It is an amenable number.

1640304833 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640304833 is an equidigital number, since it uses as much as digits as its factorization.

1640304833 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 1640304833 is about 40500.6769449598. The cubic root of 1640304833 is about 1179.3467688217.

The spelling of 1640304833 in words is "one billion, six hundred forty million, three hundred four thousand, eight hundred thirty-three".