16561065 has 16 divisors (see below), whose sum is σ = 27892800. Its totient is φ = 8367552.

The previous prime is 16561057. The next prime is 16561067. The reversal of 16561065 is 56016561.

It is not a de Polignac number, because 16561065 - 2³ = 16561057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16561067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28770 + ... + 29339.

It is an arithmetic number, because the mean of its divisors is an integer number (1743300).

Almost surely, 2^16561065 is an apocalyptic number.

16561065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16561065 is a deficient number, since it is larger than the sum of its proper divisors (11331735).

16561065 is a wasteful number, since it uses less digits than its factorization.

16561065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58136.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 16561065 is about 4069.5288425074. The cubic root of 16561065 is about 254.8958436601.

The spelling of 16561065 in words is "sixteen million, five hundred sixty-one thousand, sixty-five".