243668165 has 8 divisors (see below), whose sum is σ = 314894328. Its totient is φ = 179939520.

The previous prime is 243668149. The next prime is 243668177. The reversal of 243668165 is 561866342.

It can be written as a sum of positive squares in 4 ways, for example, as 27019204 + 216648961 = 5198^2 + 14719^2 .

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

It is not a de Polignac number, because 243668165 - 2⁴ = 243668149 is a prime.

It is a Duffinian number.

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, 1874306 + ... + 1874435.

It is an arithmetic number, because the mean of its divisors is an integer number (39361791).

Almost surely, 2^243668165 is an apocalyptic number.

It is an amenable number.

243668165 is a deficient number, since it is larger than the sum of its proper divisors (71226163).

243668165 is a wasteful number, since it uses less digits than its factorization.

243668165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748759.

The product of its digits is 207360, while the sum is 41.

The square root of 243668165 is about 15609.8739584918. The cubic root of 243668165 is about 624.5965737850.

The spelling of 243668165 in words is "two hundred forty-three million, six hundred sixty-eight thousand, one hundred sixty-five".