1066661110566 has 40 divisors (see below), whose sum is σ = 2430621384840. Its totient is φ = 349527366432.

The previous prime is 1066661110481. The next prime is 1066661110579. The reversal of 1066661110566 is 6650111666601.

It is a super-2 number, since 2×1066661110566² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 55789831 + ... + 55808946.

It is an arithmetic number, because the mean of its divisors is an integer number (60765534621).

Almost surely, 2^{1066661110566} is an apocalyptic number.

1066661110566 is an abundant number, since it is smaller than the sum of its proper divisors (1363960274274).

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

1066661110566 is a wasteful number, since it uses less digits than its factorization.

1066661110566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111598850 (or 111598841 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 1066661110566 in words is "one trillion, sixty-six billion, six hundred sixty-one million, one hundred ten thousand, five hundred sixty-six".