165053815 has 4 divisors (see below), whose sum is σ = 198064584. Its totient is φ = 132043048.

The previous prime is 165053809. The next prime is 165053849. The reversal of 165053815 is 518350561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165053815 - 2¹¹ = 165051767 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 3 ways as a sum of consecutive naturals, for example, 16505377 + ... + 16505386.

It is an arithmetic number, because the mean of its divisors is an integer number (49516146).

Almost surely, 2^165053815 is an apocalyptic number.

165053815 is a deficient number, since it is larger than the sum of its proper divisors (33010769).

165053815 is an equidigital number, since it uses as much as digits as its factorization.

165053815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33010768.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 165053815 is about 12847.3271539258. The cubic root of 165053815 is about 548.5402780273.

The spelling of 165053815 in words is "one hundred sixty-five million, fifty-three thousand, eight hundred fifteen".