16640640352 has 96 divisors (see below), whose sum is σ = 37876833792. Its totient is φ = 7049140224.

The previous prime is 16640640337. The next prime is 16640640361. The reversal of 16640640352 is 25304604661.

It is a super-2 number, since 2×16640640352² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12731283 + ... + 12732589.

It is an arithmetic number, because the mean of its divisors is an integer number (394550352).

Almost surely, 2^16640640352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16640640352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18938416896).

16640640352 is an abundant number, since it is smaller than the sum of its proper divisors (21236193440).

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

16640640352 is a wasteful number, since it uses less digits than its factorization.

16640640352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940 (or 1932 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 16640640352 in words is "sixteen billion, six hundred forty million, six hundred forty thousand, three hundred fifty-two".