161355365 has 4 divisors (see below), whose sum is σ = 193626444. Its totient is φ = 129084288.

The previous prime is 161355361. The next prime is 161355379. The reversal of 161355365 is 563553161.

It is a happy number.

161355365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 24137569 + 137217796 = 4913^2 + 11714^2 .

It is a cyclic number.

It is not a de Polignac number, because 161355365 - 2² = 161355361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161355361) 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, 16135532 + ... + 16135541.

It is an arithmetic number, because the mean of its divisors is an integer number (48406611).

Almost surely, 2^161355365 is an apocalyptic number.

It is an amenable number.

161355365 is a deficient number, since it is larger than the sum of its proper divisors (32271079).

161355365 is an equidigital number, since it uses as much as digits as its factorization.

161355365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32271078.

The product of its digits is 40500, while the sum is 35.

The square root of 161355365 is about 12702.5731645206. The cubic root of 161355365 is about 544.4121428458.

The spelling of 161355365 in words is "one hundred sixty-one million, three hundred fifty-five thousand, three hundred sixty-five".