6499784556 has 216 divisors, whose sum is σ = 18585927360. Its totient is φ = 1909440000.

The previous prime is 6499784549. The next prime is 6499784591. The reversal of 6499784556 is 6554879946.

6499784556 is a `hidden beast` number, since 6 + 4 + 9 + 9 + 78 + 4 + 556 = 666.

It is a super-2 number, since 2×6499784556² = 84494398548832234272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6499784493 and 6499784502.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 25895431 + ... + 25895681.

It is an arithmetic number, because the mean of its divisors is an integer number (86045960).

Almost surely, 2^6499784556 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 6499784556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9292963680).

6499784556 is an abundant number, since it is smaller than the sum of its proper divisors (12086142804).

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

6499784556 is a wasteful number, since it uses less digits than its factorization.

6499784556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 423 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The square root of 6499784556 is about 80621.2413449458. The cubic root of 6499784556 is about 1866.2349590235.

The spelling of 6499784556 in words is "six billion, four hundred ninety-nine million, seven hundred eighty-four thousand, five hundred fifty-six".