16016561 has 8 divisors (see below), whose sum is σ = 17545248. Its totient is φ = 14500000.

The previous prime is 16016557. The next prime is 16016591. The reversal of 16016561 is 16561061.

16016561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16016561 - 2² = 16016557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16016561.

It is not an unprimeable number, because it can be changed into a prime (16016521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140 + ... + 5661.

It is an arithmetic number, because the mean of its divisors is an integer number (2193156).

Almost surely, 2^16016561 is an apocalyptic number.

16016561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16016561 is a deficient number, since it is larger than the sum of its proper divisors (1528687).

16016561 is a wasteful number, since it uses less digits than its factorization.

16016561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6063.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 16016561 is about 4002.0695895999. The cubic root of 16016561 is about 252.0711198023.

The spelling of 16016561 in words is "sixteen million, sixteen thousand, five hundred sixty-one".