6650449920 has 520 divisors, whose sum is σ = 25213863840. Its totient is φ = 1672151040.

The previous prime is 6650449919. The next prime is 6650449921. The reversal of 6650449920 is 299440566.

It is an interprime number because it is at equal distance from previous prime (6650449919) and next prime (6650449921).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650449921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 31518615 + ... + 31518825.

Almost surely, 2^6650449920 is an apocalyptic number.

6650449920 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 6650449920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12606931920).

6650449920 is an abundant number, since it is smaller than the sum of its proper divisors (18563413920).

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

6650449920 is a wasteful number, since it uses less digits than its factorization.

6650449920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 6650449920 is about 81550.2907413579. The cubic root of 6650449920 is about 1880.5447644169.

The spelling of 6650449920 in words is "six billion, six hundred fifty million, four hundred forty-nine thousand, nine hundred twenty".