166261566 has 8 divisors (see below), whose sum is σ = 332523144. Its totient is φ = 55420520.

The previous prime is 166261541. The next prime is 166261567. The reversal of 166261566 is 665162661.

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

166261566 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166261567) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13855125 + ... + 13855136.

It is an arithmetic number, because the mean of its divisors is an integer number (41565393).

Almost surely, 2^166261566 is an apocalyptic number.

166261566 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.

166261566 is a wasteful number, since it uses less digits than its factorization.

166261566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27710266.

The product of its digits is 77760, while the sum is 39.

The square root of 166261566 is about 12894.2454606697. The cubic root of 166261566 is about 549.8749754386.

The spelling of 166261566 in words is "one hundred sixty-six million, two hundred sixty-one thousand, five hundred sixty-six".