6669561344 has 80 divisors (see below), whose sum is σ = 13960168992. Its totient is φ = 3177259008.

The previous prime is 6669561341. The next prime is 6669561373. The reversal of 6669561344 is 4431659666.

It is a junction number, because it is equal to n+sod(n) for n = 6669561292 and 6669561301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6669561341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3449402 + ... + 3451334.

Almost surely, 2^6669561344 is an apocalyptic number.

6669561344 is a gapful number since it is divisible by the number (64) 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 6669561344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6980084496).

6669561344 is an abundant number, since it is smaller than the sum of its proper divisors (7290607648).

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

6669561344 is a wasteful number, since it uses less digits than its factorization.

6669561344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2267 (or 2251 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 50.

The square root of 6669561344 is about 81667.3823750951. The cubic root of 6669561344 is about 1882.3444179124.

The spelling of 6669561344 in words is "six billion, six hundred sixty-nine million, five hundred sixty-one thousand, three hundred forty-four".