161584565525 has 6 divisors (see below), whose sum is σ = 200364861282. Its totient is φ = 129267652400.

The previous prime is 161584565431. The next prime is 161584565557. The reversal of 161584565525 is 525565485161.

161584565525 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 3 ways, for example, as 43527728689 + 118056836836 = 208633^2 + 343594^2 .

It is not a de Polignac number, because 161584565525 - 2¹⁰ = 161584564501 is a prime.

It is a super-2 number, since 2×161584565525² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3231691286 + ... + 3231691335.

It is an arithmetic number, because the mean of its divisors is an integer number (33394143547).

Almost surely, 2^161584565525 is an apocalyptic number.

It is an amenable number.

161584565525 is a deficient number, since it is larger than the sum of its proper divisors (38780295757).

161584565525 is an equidigital number, since it uses as much as digits as its factorization.

161584565525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6463382631 (or 6463382626 counting only the distinct ones).

The product of its digits is 7200000, while the sum is 53.

The spelling of 161584565525 in words is "one hundred sixty-one billion, five hundred eighty-four million, five hundred sixty-five thousand, five hundred twenty-five".