16649664160 has 60 divisors (see below), whose sum is σ = 39728179890. Its totient is φ = 6593926400.

The previous prime is 16649664149. The next prime is 16649664191. The reversal of 16649664160 is 6146694661.

It can be written as a sum of positive squares in 5 ways, for example, as 16551337104 + 98327056 = 128652^2 + 9916^2 .

It is a super-2 number, since 2×16649664160² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 164848110 + ... + 164848210.

Almost surely, 2^16649664160 is an apocalyptic number.

16649664160 is a gapful number since it is divisible by the number (10) 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 16649664160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19864089945).

16649664160 is an abundant number, since it is smaller than the sum of its proper divisors (23078515730).

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

16649664160 is an frugal number, since it uses more digits than its factorization.

16649664160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 16649664160 in words is "sixteen billion, six hundred forty-nine million, six hundred sixty-four thousand, one hundred sixty".