16538065 has 4 divisors (see below), whose sum is σ = 19845684. Its totient is φ = 13230448.

The previous prime is 16538057. The next prime is 16538087. The reversal of 16538065 is 56083561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56083561 = 17 ⋅3299033.

It can be written as a sum of positive squares in 2 ways, for example, as 10471696 + 6066369 = 3236^2 + 2463^2 .

It is a cyclic number.

It is not a de Polignac number, because 16538065 - 2³ = 16538057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16538065.

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, 1653802 + ... + 1653811.

It is an arithmetic number, because the mean of its divisors is an integer number (4961421).

Almost surely, 2^16538065 is an apocalyptic number.

It is an amenable number.

16538065 is a deficient number, since it is larger than the sum of its proper divisors (3307619).

16538065 is an equidigital number, since it uses as much as digits as its factorization.

16538065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3307618.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 16538065 is about 4066.7019807210. The cubic root of 16538065 is about 254.7777892456. Note that the first 4 decimals are identical.

The spelling of 16538065 in words is "sixteen million, five hundred thirty-eight thousand, sixty-five".