161225165 has 8 divisors (see below), whose sum is σ = 203652960. Its totient is φ = 122191632.

The previous prime is 161225159. The next prime is 161225213. The reversal of 161225165 is 561522161.

It is a happy number.

161225165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161225165 - 2⁴ = 161225149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848459 + ... + 848648.

It is an arithmetic number, because the mean of its divisors is an integer number (25456620).

Almost surely, 2^161225165 is an apocalyptic number.

It is an amenable number.

161225165 is a deficient number, since it is larger than the sum of its proper divisors (42427795).

161225165 is a wasteful number, since it uses less digits than its factorization.

161225165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697131.

The product of its digits is 3600, while the sum is 29.

The square root of 161225165 is about 12697.4471843753. The cubic root of 161225165 is about 544.2656720732.

The spelling of 161225165 in words is "one hundred sixty-one million, two hundred twenty-five thousand, one hundred sixty-five".