805841949969 has 45 divisors (see below), whose sum is σ = 1400423787147. Its totient is φ = 460448797536.

The previous prime is 805841949959. The next prime is 805841949989. The reversal of 805841949969 is 969949148508.

The square root of 805841949969 is 897687.

It is a perfect power (a square), and thus also a powerful number.

805841949969 is a `hidden beast` number, since 80 + 5 + 8 + 419 + 49 + 96 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 590842807569 + 214999142400 = 768663^2 + 463680^2 .

It is not a de Polignac number, because 805841949969 - 2²³ = 805833561361 is a prime.

It is a super-2 number, since 2×805841949969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 805841949897 and 805841949906.

It is not an unprimeable number, because it can be changed into a prime (805841949919) 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 44 ways as a sum of consecutive naturals, for example, 56547157 + ... + 56561405.

Almost surely, 2^805841949969 is an apocalyptic number.

805841949969 is the 897687-th square number.

805841949969 is the 448844-th centered octagonal number.

It is an amenable number.

805841949969 is a deficient number, since it is larger than the sum of its proper divisors (594581837178).

805841949969 is an frugal number, since it uses more digits than its factorization.

805841949969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28524 (or 14259 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 72.

The spelling of 805841949969 in words is "eight hundred five billion, eight hundred forty-one million, nine hundred forty-nine thousand, nine hundred sixty-nine".