5665561610646 has 96 divisors (see below), whose sum is σ = 13762197257472. Its totient is φ = 1522872599040.

The previous prime is 5665561610573. The next prime is 5665561610669. The reversal of 5665561610646 is 6460161655665.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29167920 + ... + 29361516.

It is an arithmetic number, because the mean of its divisors is an integer number (143356221432).

Almost surely, 2^{5665561610646} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5665561610646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6881098628736).

5665561610646 is an abundant number, since it is smaller than the sum of its proper divisors (8096635646826).

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

5665561610646 is a wasteful number, since it uses less digits than its factorization.

5665561610646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196054 (or 196037 counting only the distinct ones).

The product of its (nonzero) digits is 23328000, while the sum is 57.

The spelling of 5665561610646 in words is "five trillion, six hundred sixty-five billion, five hundred sixty-one million, six hundred ten thousand, six hundred forty-six".