166536531406566 has 48 divisors (see below), whose sum is σ = 361348718328000. Its totient is φ = 55432248378624.

The previous prime is 166536531406537. The next prime is 166536531406577. The reversal of 166536531406566 is 665604135635661.

166536531406566 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 3 + 6 + 53 + 14 + 0 + 6 + 566 = 666.

It is a super-3 number, since 3×166536531406566³ (a number of 44 digits) contains 333 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 (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 480303235 + ... + 480649841.

It is an arithmetic number, because the mean of its divisors is an integer number (7528098298500).

Almost surely, 2^{166536531406566} is an apocalyptic number.

166536531406566 is an abundant number, since it is smaller than the sum of its proper divisors (194812186921434).

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

166536531406566 is a wasteful number, since it uses less digits than its factorization.

166536531406566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384973 (or 384970 counting only the distinct ones).

The product of its (nonzero) digits is 209952000, while the sum is 63.

The spelling of 166536531406566 in words is "one hundred sixty-six trillion, five hundred thirty-six billion, five hundred thirty-one million, four hundred six thousand, five hundred sixty-six".