16668649536 has 224 divisors, whose sum is σ = 57879813120. Its totient is φ = 4101580800.

The previous prime is 16668649531. The next prime is 16668649537. The reversal of 16668649536 is 63594686661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a self number, because there is not a number n which added to its sum of digits gives 16668649536.

It is not an unprimeable number, because it can be changed into a prime (16668649531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251226 + ... + 310566.

Almost surely, 2^16668649536 is an apocalyptic number.

16668649536 is a gapful number since it is divisible by the number (16) 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 16668649536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28939906560).

16668649536 is an abundant number, since it is smaller than the sum of its proper divisors (41211163584).

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

16668649536 is a wasteful number, since it uses less digits than its factorization.

16668649536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59393 (or 59383 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 60.

The spelling of 16668649536 in words is "sixteen billion, six hundred sixty-eight million, six hundred forty-nine thousand, five hundred thirty-six".