16644366648 has 288 divisors, whose sum is σ = 58567869360. Its totient is φ = 4389396480.

The previous prime is 16644366623. The next prime is 16644366649. The reversal of 16644366648 is 84666344661.

It is a happy number.

It is a super-2 number, since 2×16644366648² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 16644366594 and 16644366603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16644366649) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1231608 + ... + 1245048.

Almost surely, 2^16644366648 is an apocalyptic number.

16644366648 is a gapful number since it is divisible by the number (18) 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 16644366648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29283934680).

16644366648 is an abundant number, since it is smaller than the sum of its proper divisors (41923502712).

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

16644366648 is a wasteful number, since it uses less digits than its factorization.

16644366648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13489 (or 13466 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 54.

The spelling of 16644366648 in words is "sixteen billion, six hundred forty-four million, three hundred sixty-six thousand, six hundred forty-eight".