16665071 has 4 divisors (see below), whose sum is σ = 17542200. Its totient is φ = 15787944.

The previous prime is 16665043. The next prime is 16665137. The reversal of 16665071 is 17056661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16665071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16665001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438536 + ... + 438573.

It is an arithmetic number, because the mean of its divisors is an integer number (4385550).

Almost surely, 2^16665071 is an apocalyptic number.

16665071 is a deficient number, since it is larger than the sum of its proper divisors (877129).

16665071 is an equidigital number, since it uses as much as digits as its factorization.

16665071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877128.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 16665071 is about 4082.2874715042. The cubic root of 16665071 is about 255.4283253749.

The spelling of 16665071 in words is "sixteen million, six hundred sixty-five thousand, seventy-one".