1640840011 has 2 divisors, whose sum is σ = 1640840012. Its totient is φ = 1640840010.

The previous prime is 1640840009. The next prime is 1640840029. The reversal of 1640840011 is 1100480461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1640840011 - 2¹ = 1640840009 is a prime.

Together with 1640840009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1640840081) 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, 820420005 + 820420006.

It is an arithmetic number, because the mean of its divisors is an integer number (820420006).

Almost surely, 2^1640840011 is an apocalyptic number.

1640840011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640840011 is an equidigital number, since it uses as much as digits as its factorization.

1640840011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 1640840011 is about 40507.2834315016. The cubic root of 1640840011 is about 1179.4750156781.

The spelling of 1640840011 in words is "one billion, six hundred forty million, eight hundred forty thousand, eleven".