6649715520 has 672 divisors, whose sum is σ = 27728265600. Its totient is φ = 1495646208.

The previous prime is 6649715509. The next prime is 6649715531. The reversal of 6649715520 is 255179466.

6649715520 is a `hidden beast` number, since 6 + 6 + 4 + 97 + 1 + 552 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (6649715509) and next prime (6649715531).

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 47839611 + ... + 47839749.

It is an arithmetic number, because the mean of its divisors is an integer number (41262300).

Almost surely, 2^6649715520 is an apocalyptic number.

6649715520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6649715520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13864132800).

6649715520 is an abundant number, since it is smaller than the sum of its proper divisors (21078550080).

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

6649715520 is a wasteful number, since it uses less digits than its factorization.

6649715520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 6649715520 is about 81545.7878740527. The cubic root of 6649715520 is about 1880.4755398817.

The spelling of 6649715520 in words is "six billion, six hundred forty-nine million, seven hundred fifteen thousand, five hundred twenty".