6451980920 has 128 divisors (see below), whose sum is σ = 18468864000. Its totient is φ = 2010960000.

The previous prime is 6451980911. The next prime is 6451980959. The reversal of 6451980920 is 290891546.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 129545 + ... + 172295.

It is an arithmetic number, because the mean of its divisors is an integer number (144288000).

Almost surely, 2^6451980920 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 6451980920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9234432000).

6451980920 is an abundant number, since it is smaller than the sum of its proper divisors (12016883080).

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

6451980920 is a wasteful number, since it uses less digits than its factorization.

6451980920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42794 (or 42776 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 6451980920 is about 80324.2237435258. The cubic root of 6451980920 is about 1861.6485288326.

The spelling of 6451980920 in words is "six billion, four hundred fifty-one million, nine hundred eighty thousand, nine hundred twenty".