165512216 has 16 divisors (see below), whose sum is σ = 316191600. Its totient is φ = 81194464.

The previous prime is 165512183. The next prime is 165512231. The reversal of 165512216 is 612215561.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194756 + ... + 195603.

It is an arithmetic number, because the mean of its divisors is an integer number (19761975).

Almost surely, 2^165512216 is an apocalyptic number.

It is an amenable number.

165512216 is a deficient number, since it is larger than the sum of its proper divisors (150679384).

165512216 is a wasteful number, since it uses less digits than its factorization.

165512216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390418 (or 390414 counting only the distinct ones).

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

The square root of 165512216 is about 12865.1551098306. The cubic root of 165512216 is about 549.0476256595.

Adding to 165512216 its reverse (612215561), we get a palindrome (777727777).

The spelling of 165512216 in words is "one hundred sixty-five million, five hundred twelve thousand, two hundred sixteen".