16521065 has 16 divisors (see below), whose sum is σ = 21802176. Its totient is φ = 11918400.

The previous prime is 16521053. The next prime is 16521091. The reversal of 16521065 is 56012561.

It is not a de Polignac number, because 16521065 - 2¹⁴ = 16504681 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6059 + ... + 8351.

It is an arithmetic number, because the mean of its divisors is an integer number (1362636).

Almost surely, 2^16521065 is an apocalyptic number.

It is an amenable number.

16521065 is a deficient number, since it is larger than the sum of its proper divisors (5281111).

16521065 is a wasteful number, since it uses less digits than its factorization.

16521065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 16521065 is about 4064.6112975290. The cubic root of 16521065 is about 254.6904612676.

The spelling of 16521065 in words is "sixteen million, five hundred twenty-one thousand, sixty-five".