161471428889 has 4 divisors (see below), whose sum is σ = 162141435060. Its totient is φ = 160801422720.

The previous prime is 161471428843. The next prime is 161471428891. The reversal of 161471428889 is 988824174161.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 135933790864 + 25537638025 = 368692^2 + 159805^2 .

It is a cyclic number.

It is not a de Polignac number, because 161471428889 - 2¹⁶ = 161471363353 is a prime.

It is a super-3 number, since 3×161471428889³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161471628889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335002724 + ... + 335003205.

It is an arithmetic number, because the mean of its divisors is an integer number (40535358765).

Almost surely, 2^161471428889 is an apocalyptic number.

It is an amenable number.

161471428889 is a deficient number, since it is larger than the sum of its proper divisors (670006171).

161471428889 is an equidigital number, since it uses as much as digits as its factorization.

161471428889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670006170.

The product of its digits is 6193152, while the sum is 59.

The spelling of 161471428889 in words is "one hundred sixty-one billion, four hundred seventy-one million, four hundred twenty-eight thousand, eight hundred eighty-nine".