5665661610066 has 96 divisors (see below), whose sum is σ = 12624724240128. Its totient is φ = 1835741859840.

The previous prime is 5665661609989. The next prime is 5665661610067. The reversal of 5665661610066 is 6600161665665.

5665661610066 is a `hidden beast` number, since 5 + 6 + 6 + 5 + 6 + 616 + 10 + 0 + 6 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 5665661609994 and 5665661610021.

It is not an unprimeable number, because it can be changed into a prime (5665661610067) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32516170 + ... + 32689946.

It is an arithmetic number, because the mean of its divisors is an integer number (131507544168).

Almost surely, 2^{5665661610066} is an apocalyptic number.

5665661610066 is an abundant number, since it is smaller than the sum of its proper divisors (6959062630062).

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

5665661610066 is a wasteful number, since it uses less digits than its factorization.

5665661610066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174216 (or 174213 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 5665661610066 in words is "five trillion, six hundred sixty-five billion, six hundred sixty-one million, six hundred ten thousand, sixty-six".