66106560665655 has 32 divisors (see below), whose sum is σ = 117523453132800. Its totient is φ = 35256628770336.

The previous prime is 66106560665641. The next prime is 66106560665657. The reversal of 66106560665655 is 55656606560166.

66106560665655 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 6 + 5 + 6 + 0 + 66 + 565 + 5 = 666.

It is not a de Polignac number, because 66106560665655 - 2⁵ = 66106560665623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66106560665592 and 66106560665601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66106560665657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23698026 + ... + 26340264.

It is an arithmetic number, because the mean of its divisors is an integer number (3672607910400).

Almost surely, 2^{66106560665655} is an apocalyptic number.

66106560665655 is a deficient number, since it is larger than the sum of its proper divisors (51416892467145).

66106560665655 is a wasteful number, since it uses less digits than its factorization.

66106560665655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827580 (or 2827574 counting only the distinct ones).

The product of its (nonzero) digits is 174960000, while the sum is 63.

The spelling of 66106560665655 in words is "sixty-six trillion, one hundred six billion, five hundred sixty million, six hundred sixty-five thousand, six hundred fifty-five".