16535665 has 8 divisors (see below), whose sum is σ = 19882728. Its totient is φ = 13201920.

The previous prime is 16535663. The next prime is 16535677. The reversal of 16535665 is 56653561.

It is a happy number.

16535665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1411344 + 15124321 = 1188^2 + 3889^2 .

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

It is not a de Polignac number, because 16535665 - 2¹ = 16535663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16535663) 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, 352 + ... + 5761.

It is an arithmetic number, because the mean of its divisors is an integer number (2485341).

Almost surely, 2^16535665 is an apocalyptic number.

It is an amenable number.

16535665 is a deficient number, since it is larger than the sum of its proper divisors (3347063).

16535665 is an equidigital number, since it uses as much as digits as its factorization.

16535665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6659.

The product of its digits is 81000, while the sum is 37.

The square root of 16535665 is about 4066.4068906099. The cubic root of 16535665 is about 254.7654642190.

The spelling of 16535665 in words is "sixteen million, five hundred thirty-five thousand, six hundred sixty-five".