840642323246009 has 2 divisors, whose sum is σ = 840642323246010. Its totient is φ = 840642323246008.

The previous prime is 840642323245969. The next prime is 840642323246087. The reversal of 840642323246009 is 900642323246048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 466933884474409 + 373708438771600 = 21608653^2 + 19331540^2 .

It is a cyclic number.

It is not a de Polignac number, because 840642323246009 - 2¹² = 840642323241913 is a prime.

It is not a weakly prime, because it can be changed into another prime (840642323249009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420321161623004 + 420321161623005.

It is an arithmetic number, because the mean of its divisors is an integer number (420321161623005).

Almost surely, 2^{840642323246009} is an apocalyptic number.

It is an amenable number.

840642323246009 is a deficient number, since it is larger than the sum of its proper divisors (1).

840642323246009 is an equidigital number, since it uses as much as digits as its factorization.

840642323246009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11943936, while the sum is 53.

The spelling of 840642323246009 in words is "eight hundred forty trillion, six hundred forty-two billion, three hundred twenty-three million, two hundred forty-six thousand, nine".