16644545 has 4 divisors (see below), whose sum is σ = 19973460. Its totient is φ = 13315632.

The previous prime is 16644539. The next prime is 16644553. The reversal of 16644545 is 54544661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3713329 + 12931216 = 1927^2 + 3596^2 .

It is a cyclic number.

It is not a de Polignac number, because 16644545 - 2¹⁰ = 16643521 is a prime.

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, 1664450 + ... + 1664459.

It is an arithmetic number, because the mean of its divisors is an integer number (4993365).

Almost surely, 2^16644545 is an apocalyptic number.

It is an amenable number.

16644545 is a deficient number, since it is larger than the sum of its proper divisors (3328915).

16644545 is an equidigital number, since it uses as much as digits as its factorization.

16644545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328914.

The product of its digits is 57600, while the sum is 35.

The square root of 16644545 is about 4079.7726652352. The cubic root of 16644545 is about 255.3234138144.

The spelling of 16644545 in words is "sixteen million, six hundred forty-four thousand, five hundred forty-five".