16646420440 has 64 divisors (see below), whose sum is σ = 40417020000. Its totient is φ = 6133957632.

The previous prime is 16646420369. The next prime is 16646420447. The reversal of 16646420440 is 4402464661.

16646420440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 16646420440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16646420447) 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, 227404 + ... + 291556.

Almost surely, 2^16646420440 is an apocalyptic number.

16646420440 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 16646420440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20208510000).

16646420440 is an abundant number, since it is smaller than the sum of its proper divisors (23770599560).

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

16646420440 is a wasteful number, since it uses less digits than its factorization.

16646420440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64676 (or 64672 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 16646420440 in words is "sixteen billion, six hundred forty-six million, four hundred twenty thousand, four hundred forty".