16663040 has 80 divisors (see below), whose sum is σ = 41836608. Its totient is φ = 6352896.

The previous prime is 16663037. The next prime is 16663091. The reversal of 16663040 is 4036661.

It is a tau number, because it is divible by the number of its divisors (80).

It is a nialpdrome in base 8 and base 16.

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, 58739 + ... + 59021.

Almost surely, 2^16663040 is an apocalyptic number.

16663040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16663040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20918304).

16663040 is an abundant number, since it is smaller than the sum of its proper divisors (25173568).

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

16663040 is an equidigital number, since it uses as much as digits as its factorization.

16663040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 16663040 is about 4082.0387063329. The cubic root of 16663040 is about 255.4179484613.

The spelling of 16663040 in words is "sixteen million, six hundred sixty-three thousand, forty".