5661445663601 has 16 divisors (see below), whose sum is σ = 7192705164288. Its totient is φ = 4334889268800.

The previous prime is 5661445663597. The next prime is 5661445663613. The reversal of 5661445663601 is 1063665441665.

It is a cyclic number.

It is not a de Polignac number, because 5661445663601 - 2² = 5661445663597 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (5661445666601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1003443770 + ... + 1003449411.

It is an arithmetic number, because the mean of its divisors is an integer number (449544072768).

Almost surely, 2^{5661445663601} is an apocalyptic number.

It is an amenable number.

5661445663601 is a deficient number, since it is larger than the sum of its proper divisors (1531259500687).

5661445663601 is a wasteful number, since it uses less digits than its factorization.

5661445663601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006893232.

The product of its (nonzero) digits is 9331200, while the sum is 53.

The spelling of 5661445663601 in words is "five trillion, six hundred sixty-one billion, four hundred forty-five million, six hundred sixty-three thousand, six hundred one".