16644385212 has 192 divisors, whose sum is σ = 50277556224. Its totient is φ = 4167521280.

The previous prime is 16644385207. The next prime is 16644385217. The reversal of 16644385212 is 21258344661.

It is an interprime number because it is at equal distance from previous prime (16644385207) and next prime (16644385217).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644385217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1789518 + ... + 1798794.

It is an arithmetic number, because the mean of its divisors is an integer number (261862272).

Almost surely, 2^16644385212 is an apocalyptic number.

16644385212 is a gapful number since it is divisible by the number (12) 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 16644385212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25138778112).

16644385212 is an abundant number, since it is smaller than the sum of its proper divisors (33633171012).

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

16644385212 is a wasteful number, since it uses less digits than its factorization.

16644385212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9388 (or 9386 counting only the distinct ones).

The product of its digits is 276480, while the sum is 42.

It can be divided in two parts, 16644 and 385212, that added together give a triangular number (401856 = T₈₉₆).

The spelling of 16644385212 in words is "sixteen billion, six hundred forty-four million, three hundred eighty-five thousand, two hundred twelve".