16663440 has 40 divisors (see below), whose sum is σ = 51657408. Its totient is φ = 4443520.

The previous prime is 16663433. The next prime is 16663441. The reversal of 16663440 is 4436661.

16663440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 16663398 and 16663407.

It is not an unprimeable number, because it can be changed into a prime (16663441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34476 + ... + 34955.

Almost surely, 2^16663440 is an apocalyptic number.

16663440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16663440 is an abundant number, since it is smaller than the sum of its proper divisors (34993968).

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

16663440 is a wasteful number, since it uses less digits than its factorization.

16663440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69447 (or 69441 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 16663440 is about 4082.0877011647. The cubic root of 16663440 is about 255.4199922333.

The spelling of 16663440 in words is "sixteen million, six hundred sixty-three thousand, four hundred forty".