1840820656009 has 2 divisors, whose sum is σ = 1840820656010. Its totient is φ = 1840820656008.

The previous prime is 1840820656001. The next prime is 1840820656069. The reversal of 1840820656009 is 9006560280481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026128480400 + 814692175609 = 1012980^2 + 902603^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840820656009 - 2³ = 1840820656001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1840820656001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920410328004 + 920410328005.

It is an arithmetic number, because the mean of its divisors is an integer number (920410328005).

Almost surely, 2^{1840820656009} is an apocalyptic number.

It is an amenable number.

1840820656009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840820656009 is an equidigital number, since it uses as much as digits as its factorization.

1840820656009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 1840820656009 in words is "one trillion, eight hundred forty billion, eight hundred twenty million, six hundred fifty-six thousand, nine".