16660549 has 4 divisors (see below), whose sum is σ = 17537440. Its totient is φ = 15783660.

The previous prime is 16660543. The next prime is 16660577. The reversal of 16660549 is 94506661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16660549 - 2⁵ = 16660517 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 (16660543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438417 + ... + 438454.

It is an arithmetic number, because the mean of its divisors is an integer number (4384360).

Almost surely, 2^16660549 is an apocalyptic number.

16660549 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16660549 is a deficient number, since it is larger than the sum of its proper divisors (876891).

16660549 is an equidigital number, since it uses as much as digits as its factorization.

16660549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876890.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 16660549 is about 4081.7335777829. The cubic root of 16660549 is about 255.4052201353.

The spelling of 16660549 in words is "sixteen million, six hundred sixty thousand, five hundred forty-nine".