1066055515566 has 8 divisors (see below), whose sum is σ = 2132111031144. Its totient is φ = 355351838520.

The previous prime is 1066055515471. The next prime is 1066055515573. The reversal of 1066055515566 is 6655155506601.

It is a sphenic number, since it is the product of 3 distinct primes.

1066055515566 is an admirable number.

It is a super-2 number, since 2×1066055515566² (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 3 ways as a sum of consecutive naturals, for example, 88837959625 + ... + 88837959636.

It is an arithmetic number, because the mean of its divisors is an integer number (266513878893).

Almost surely, 2^{1066055515566} is an apocalyptic number.

1066055515566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1066055515566 is a wasteful number, since it uses less digits than its factorization.

1066055515566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177675919266.

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 1066055515566 in words is "one trillion, sixty-six billion, fifty-five million, five hundred fifteen thousand, five hundred sixty-six".