16660345 has 8 divisors (see below), whose sum is σ = 21530376. Its totient is φ = 12302976.

The previous prime is 16660337. The next prime is 16660351. The reversal of 16660345 is 54306661.

It can be written as a sum of positive squares in 4 ways, for example, as 38416 + 16621929 = 196^2 + 4077^2 .

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 16660345 - 2³ = 16660337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 128092 + ... + 128221.

It is an arithmetic number, because the mean of its divisors is an integer number (2691297).

Almost surely, 2^16660345 is an apocalyptic number.

It is an amenable number.

16660345 is a deficient number, since it is larger than the sum of its proper divisors (4870031).

16660345 is a wasteful number, since it uses less digits than its factorization.

16660345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256331.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 16660345 is about 4081.7085883243. The cubic root of 16660345 is about 255.4041776951.

The spelling of 16660345 in words is "sixteen million, six hundred sixty thousand, three hundred forty-five".