16663467640 has 64 divisors (see below), whose sum is σ = 38933667360. Its totient is φ = 6413690880.

The previous prime is 16663467637. The next prime is 16663467641. The reversal of 16663467640 is 4676436661.

16663467640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16663467641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50127 + ... + 189313.

Almost surely, 2^16663467640 is an apocalyptic number.

16663467640 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 16663467640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19466833680).

16663467640 is an abundant number, since it is smaller than the sum of its proper divisors (22270199720).

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

16663467640 is a wasteful number, since it uses less digits than its factorization.

16663467640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139312 (or 139308 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 49.

The spelling of 16663467640 in words is "sixteen billion, six hundred sixty-three million, four hundred sixty-seven thousand, six hundred forty".