216168965 has 8 divisors (see below), whose sum is σ = 259513848. Its totient is φ = 172861120.

The previous prime is 216168959. The next prime is 216168971. The reversal of 216168965 is 569861612.

It is an interprime number because it is at equal distance from previous prime (216168959) and next prime (216168971).

It can be written as a sum of positive squares in 4 ways, for example, as 14273284 + 201895681 = 3778^2 + 14209^2 .

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

It is not a de Polignac number, because 216168965 - 2⁴ = 216168949 is a prime.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5819 + ... + 21591.

It is an arithmetic number, because the mean of its divisors is an integer number (32439231).

Almost surely, 2^216168965 is an apocalyptic number.

It is an amenable number.

216168965 is a deficient number, since it is larger than the sum of its proper divisors (43344883).

216168965 is a wasteful number, since it uses less digits than its factorization.

216168965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18519.

The product of its digits is 155520, while the sum is 44.

The square root of 216168965 is about 14702.6856390253. The cubic root of 216168965 is about 600.1564082979.

The spelling of 216168965 in words is "two hundred sixteen million, one hundred sixty-eight thousand, nine hundred sixty-five".