16649145 has 48 divisors (see below), whose sum is σ = 30506112. Its totient is φ = 8709120.

The previous prime is 16649131. The next prime is 16649147. The reversal of 16649145 is 54194661.

16649145 is a `hidden beast` number, since 1 + 6 + 649 + 1 + 4 + 5 = 666.

It is not a de Polignac number, because 16649145 - 2⁸ = 16648889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16649147) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86169 + ... + 86361.

It is an arithmetic number, because the mean of its divisors is an integer number (635544).

Almost surely, 2^16649145 is an apocalyptic number.

16649145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16649145 is a deficient number, since it is larger than the sum of its proper divisors (13856967).

16649145 is an equidigital number, since it uses as much as digits as its factorization.

16649145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284 (or 272 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 16649145 is about 4080.3363831920. The cubic root of 16649145 is about 255.3469326214.

The spelling of 16649145 in words is "sixteen million, six hundred forty-nine thousand, one hundred forty-five".