16664420433600 has 840 divisors, whose sum is σ = 62438687657808. Its totient is φ = 4358740377600.

The previous prime is 16664420433599. The next prime is 16664420433607. The reversal of 16664420433600 is 633402446661.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (16664420433607) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1420539735 + ... + 1420551465.

Almost surely, 2^{16664420433600} is an apocalyptic number.

16664420433600 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 16664420433600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31219343828904).

16664420433600 is an abundant number, since it is smaller than the sum of its proper divisors (45774267224208).

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

16664420433600 is a wasteful number, since it uses less digits than its factorization.

16664420433600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11975 (or 11951 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 45.

The spelling of 16664420433600 in words is "sixteen trillion, six hundred sixty-four billion, four hundred twenty million, four hundred thirty-three thousand, six hundred".