166066006566 has 16 divisors (see below), whose sum is σ = 332536568688. Its totient is φ = 55287909600.

The previous prime is 166066006553. The next prime is 166066006621. The reversal of 166066006566 is 665600660661.

It is a super-2 number, since 2×166066006566² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16851145 + ... + 16860996.

It is an arithmetic number, because the mean of its divisors is an integer number (20783535543).

Almost surely, 2^166066006566 is an apocalyptic number.

166066006566 is an abundant number, since it is smaller than the sum of its proper divisors (166470562122).

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

166066006566 is a wasteful number, since it uses less digits than its factorization.

166066006566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33712967.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 166066006566 in words is "one hundred sixty-six billion, sixty-six million, six thousand, five hundred sixty-six".