5661661161105 has 64 divisors (see below), whose sum is σ = 10086657926400. Its totient is φ = 3013113600000.

The previous prime is 5661661161077. The next prime is 5661661161109. The reversal of 5661661161105 is 5011611661665.

5661661161105 is a `hidden beast` number, since 5 + 6 + 6 + 16 + 6 + 11 + 611 + 0 + 5 = 666.

It is not a de Polignac number, because 5661661161105 - 2⁸ = 5661661160849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (5661661161109) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 150954855 + ... + 150992355.

It is an arithmetic number, because the mean of its divisors is an integer number (157604030100).

Almost surely, 2^{5661661161105} is an apocalyptic number.

It is an amenable number.

5661661161105 is a deficient number, since it is larger than the sum of its proper divisors (4424996765295).

5661661161105 is a wasteful number, since it uses less digits than its factorization.

5661661161105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39871 (or 39865 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

It can be divided in two parts, 566166 and 1161105, that added together give a palindrome (1727271).

The spelling of 5661661161105 in words is "five trillion, six hundred sixty-one billion, six hundred sixty-one million, one hundred sixty-one thousand, one hundred five".