16665648 has 20 divisors (see below), whose sum is σ = 43053048. Its totient is φ = 5555200.

The previous prime is 16665643. The next prime is 16665673. The reversal of 16665648 is 84656661.

16665648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×16665648³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16665643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173553 + ... + 173648.

Almost surely, 2^16665648 is an apocalyptic number.

It is an amenable number.

16665648 is an abundant number, since it is smaller than the sum of its proper divisors (26387400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16665648 is a wasteful number, since it uses less digits than its factorization.

16665648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347212 (or 347206 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 16665648 is about 4082.3581420547. The cubic root of 16665648 is about 255.4312732660.

The spelling of 16665648 in words is "sixteen million, six hundred sixty-five thousand, six hundred forty-eight".