16659145 has 4 divisors (see below), whose sum is σ = 19990980. Its totient is φ = 13327312.

The previous prime is 16659127. The next prime is 16659163. The reversal of 16659145 is 54195661.

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

It is an interprime number because it is at equal distance from previous prime (16659127) and next prime (16659163).

It can be written as a sum of positive squares in 2 ways, for example, as 6843456 + 9815689 = 2616^2 + 3133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16659145 is a prime.

It is a super-2 number, since 2×16659145² = 555054224262050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665910 + ... + 1665919.

It is an arithmetic number, because the mean of its divisors is an integer number (4997745).

Almost surely, 2^16659145 is an apocalyptic number.

It is an amenable number.

16659145 is a deficient number, since it is larger than the sum of its proper divisors (3331835).

16659145 is an equidigital number, since it uses as much as digits as its factorization.

16659145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331834.

The product of its digits is 32400, while the sum is 37.

The square root of 16659145 is about 4081.5615884120. The cubic root of 16659145 is about 255.3980455217.

The spelling of 16659145 in words is "sixteen million, six hundred fifty-nine thousand, one hundred forty-five".