6504551020 has 72 divisors (see below), whose sum is σ = 15152583600. Its totient is φ = 2343496320.

The previous prime is 6504550967. The next prime is 6504551063. The reversal of 6504551020 is 201554056.

It is a self number, because there is not a number n which added to its sum of digits gives 6504551020.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251451 + ... + 276109.

It is an arithmetic number, because the mean of its divisors is an integer number (210452550).

Almost surely, 2^6504551020 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 6504551020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7576291800).

6504551020 is an abundant number, since it is smaller than the sum of its proper divisors (8648032580).

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

6504551020 is a wasteful number, since it uses less digits than its factorization.

6504551020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24799 (or 24786 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 6504551020 is about 80650.7967722576. The cubic root of 6504551020 is about 1866.6910340498.

The spelling of 6504551020 in words is "six billion, five hundred four million, five hundred fifty-one thousand, twenty".