16640320860 has 120 divisors (see below), whose sum is σ = 53312212800. Its totient is φ = 4342985856.

The previous prime is 16640320841. The next prime is 16640320871. The reversal of 16640320860 is 6802304661.

16640320860 is a `hidden beast` number, since 1 + 6 + 640 + 3 + 2 + 0 + 8 + 6 + 0 = 666.

It is a super-2 number, since 2×16640320860² (a number of 21 digits) contains 22 as substring.

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 39 ways as a sum of consecutive naturals, for example, 33135 + ... + 185414.

It is an arithmetic number, because the mean of its divisors is an integer number (444268440).

Almost surely, 2^16640320860 is an apocalyptic number.

16640320860 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 16640320860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26656106400).

16640320860 is an abundant number, since it is smaller than the sum of its proper divisors (36671891940).

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

16640320860 is a wasteful number, since it uses less digits than its factorization.

16640320860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218617 (or 218606 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 16640320860 in words is "sixteen billion, six hundred forty million, three hundred twenty thousand, eight hundred sixty".