6501220000 has 240 divisors, whose sum is σ = 18067341600. Its totient is φ = 2280320000.

The previous prime is 6501219943. The next prime is 6501220021. The reversal of 6501220000 is 221056.

It is a happy number.

It is a super-2 number, since 2×6501220000² = 84531722976800000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6379491 + ... + 6380509.

It is an arithmetic number, because the mean of its divisors is an integer number (75280590).

Almost surely, 2^6501220000 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 6501220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9033670800).

6501220000 is an abundant number, since it is smaller than the sum of its proper divisors (11566121600).

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

6501220000 is a wasteful number, since it uses less digits than its factorization.

6501220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 6501220000 is about 80630.1432468032. The cubic root of 6501220000 is about 1866.3723317098.

Adding to 6501220000 its reverse (221056), we get a palindrome (6501441056).

The spelling of 6501220000 in words is "six billion, five hundred one million, two hundred twenty thousand".