16655640 has 32 divisors (see below), whose sum is σ = 49967280. Its totient is φ = 4441472.

The previous prime is 16655633. The next prime is 16655651. The reversal of 16655640 is 4655661.

16655640 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent 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, 69279 + ... + 69518.

Almost surely, 2^16655640 is an apocalyptic number.

16655640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16655640 is an abundant number, since it is smaller than the sum of its proper divisors (33311640).

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

16655640 is a wasteful number, since it uses less digits than its factorization.

16655640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138811 (or 138807 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 16655640 is about 4081.1321958496. The cubic root of 16655640 is about 255.3801327790.

The spelling of 16655640 in words is "sixteen million, six hundred fifty-five thousand, six hundred forty".