16640324064 has 540 divisors, whose sum is σ = 62236707624. Its totient is φ = 4130500608.

The previous prime is 16640324059. The next prime is 16640324111. The reversal of 16640324064 is 46042304661.

16640324064 is a `hidden beast` number, since 1 + 6 + 6 + 403 + 240 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 978842584 + ... + 978842600.

Almost surely, 2^16640324064 is an apocalyptic number.

16640324064 is a gapful number since it is divisible by the number (14) 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 16640324064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31118353812).

16640324064 is an abundant number, since it is smaller than the sum of its proper divisors (45596383560).

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

16640324064 is an equidigital number, since it uses as much as digits as its factorization.

16640324064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 16640324064 in words is "sixteen billion, six hundred forty million, three hundred twenty-four thousand, sixty-four".