16171445889 has 81 divisors (see below), whose sum is σ = 26039758563. Its totient is φ = 9668761344.

The previous prime is 16171445881. The next prime is 16171445893. The reversal of 16171445889 is 98854417161.

The square root of 16171445889 is 127167.

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

16171445889 is a `hidden beast` number, since 1 + 6 + 17 + 1 + 44 + 588 + 9 = 666.

16171445889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7261596225 + 8909849664 = 85215^2 + 94392^2 .

It is not a de Polignac number, because 16171445889 - 2³ = 16171445881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16171445881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 166715889 + ... + 166715985.

Almost surely, 2^16171445889 is an apocalyptic number.

16171445889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16171445889 is the 127167-th square number.

16171445889 is the 63584-th centered octagonal number.

It is an amenable number.

16171445889 is a deficient number, since it is larger than the sum of its proper divisors (9868312674).

16171445889 is an equidigital number, since it uses as much as digits as its factorization.

16171445889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 142 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 16171445889 in words is "sixteen billion, one hundred seventy-one million, four hundred forty-five thousand, eight hundred eighty-nine".