16645385 has 8 divisors (see below), whose sum is σ = 20461896. Its totient is φ = 12991360.

The previous prime is 16645367. The next prime is 16645411. The reversal of 16645385 is 58354661.

It can be written as a sum of positive squares in 4 ways, for example, as 153664 + 16491721 = 392^2 + 4061^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16645385 - 2⁸ = 16645129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40394 + ... + 40803.

It is an arithmetic number, because the mean of its divisors is an integer number (2557737).

Almost surely, 2^16645385 is an apocalyptic number.

It is an amenable number.

16645385 is a deficient number, since it is larger than the sum of its proper divisors (3816511).

16645385 is an equidigital number, since it uses as much as digits as its factorization.

16645385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81243.

The product of its digits is 86400, while the sum is 38.

The square root of 16645385 is about 4079.8756108489. The cubic root of 16645385 is about 255.3277088765.

The spelling of 16645385 in words is "sixteen million, six hundred forty-five thousand, three hundred eighty-five".