6516989220 has 144 divisors (see below), whose sum is σ = 21433845888. Its totient is φ = 1475066880.

The previous prime is 6516989173. The next prime is 6516989221. The reversal of 6516989220 is 229896156.

It is a super-2 number, since 2×6516989220² = 84942296987192416800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6516989220.

It is not an unprimeable number, because it can be changed into a prime (6516989221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 292060 + ... + 313580.

It is an arithmetic number, because the mean of its divisors is an integer number (148846152).

Almost surely, 2^6516989220 is an apocalyptic number.

6516989220 is a gapful number since it is divisible by the number (60) 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 6516989220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10716922944).

6516989220 is an abundant number, since it is smaller than the sum of its proper divisors (14916856668).

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

6516989220 is a wasteful number, since it uses less digits than its factorization.

6516989220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21650 (or 21641 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 6516989220 is about 80727.8713952003. The cubic root of 6516989220 is about 1867.8801241954.

The spelling of 6516989220 in words is "six billion, five hundred sixteen million, nine hundred eighty-nine thousand, two hundred twenty".