5661320826 has 64 divisors (see below), whose sum is σ = 13636224000. Its totient is φ = 1530700416.

The previous prime is 5661320803. The next prime is 5661320837. The reversal of 5661320826 is 6280231665.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 833721 + ... + 840483.

It is an arithmetic number, because the mean of its divisors is an integer number (213066000).

Almost surely, 2^5661320826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661320826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6818112000).

5661320826 is an abundant number, since it is smaller than the sum of its proper divisors (7974903174).

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

5661320826 is a wasteful number, since it uses less digits than its factorization.

5661320826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7843.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 5661320826 is about 75241.7492220908. The cubic root of 5661320826 is about 1782.2662740532.

The spelling of 5661320826 in words is "five billion, six hundred sixty-one million, three hundred twenty thousand, eight hundred twenty-six".