5661243905680 has 80 divisors (see below), whose sum is σ = 14385515928768. Its totient is φ = 2054828736000.

The previous prime is 5661243905663. The next prime is 5661243905719. The reversal of 5661243905680 is 865093421665.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5469606 + ... + 6421765.

Almost surely, 2^{5661243905680} is an apocalyptic number.

It is an amenable number.

5661243905680 is an abundant number, since it is smaller than the sum of its proper divisors (8724272023088).

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

5661243905680 is a wasteful number, since it uses less digits than its factorization.

5661243905680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11891936 (or 11891930 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 55.

The spelling of 5661243905680 in words is "five trillion, six hundred sixty-one billion, two hundred forty-three million, nine hundred five thousand, six hundred eighty".