805144201643 has 4 divisors (see below), whose sum is σ = 820335601728. Its totient is φ = 789952801560.

The previous prime is 805144201501. The next prime is 805144201717. The reversal of 805144201643 is 346102441508.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 805144201643 - 2¹² = 805144197547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 805144201597 and 805144201606.

It is not an unprimeable number, because it can be changed into a prime (805144201943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7595699963 + ... + 7595700068.

It is an arithmetic number, because the mean of its divisors is an integer number (205083900432).

Almost surely, 2^805144201643 is an apocalyptic number.

805144201643 is a deficient number, since it is larger than the sum of its proper divisors (15191400085).

805144201643 is a wasteful number, since it uses less digits than its factorization.

805144201643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15191400084.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 805144201643 in words is "eight hundred five billion, one hundred forty-four million, two hundred one thousand, six hundred forty-three".