844428393171 has 60 divisors (see below), whose sum is σ = 1388738096592. Its totient is φ = 510959988000.

The previous prime is 844428393169. The next prime is 844428393199. The reversal of 844428393171 is 171393824448.

844428393171 is a `hidden beast` number, since 8 + 4 + 44 + 283 + 9 + 317 + 1 = 666.

It is not a de Polignac number, because 844428393171 - 2¹ = 844428393169 is a prime.

It is a super-2 number, since 2×844428393171² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (844428393121) 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 59 ways as a sum of consecutive naturals, for example, 6116161 + ... + 6252701.

Almost surely, 2^844428393171 is an apocalyptic number.

844428393171 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

844428393171 is a deficient number, since it is larger than the sum of its proper divisors (544309703421).

844428393171 is a wasteful number, since it uses less digits than its factorization.

844428393171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137206 (or 137186 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 844428393171 in words is "eight hundred forty-four billion, four hundred twenty-eight million, three hundred ninety-three thousand, one hundred seventy-one".