6646276520 has 64 divisors (see below), whose sum is σ = 16199946000. Its totient is φ = 2453977344.

The previous prime is 6646276499. The next prime is 6646276529. The reversal of 6646276520 is 256726466.

It can be written as a sum of positive squares in 8 ways, for example, as 97259044 + 6549017476 = 9862^2 + 80926^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646276529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50066 + ... + 125694.

Almost surely, 2^6646276520 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 6646276520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8099973000).

6646276520 is an abundant number, since it is smaller than the sum of its proper divisors (9553669480).

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

6646276520 is a wasteful number, since it uses less digits than its factorization.

6646276520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75679 (or 75649 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 6646276520 is about 81524.6988341570. The cubic root of 6646276520 is about 1880.1513119499.

The spelling of 6646276520 in words is "six billion, six hundred forty-six million, two hundred seventy-six thousand, five hundred twenty".