166056655 has 4 divisors (see below), whose sum is σ = 199267992. Its totient is φ = 132845320.

The previous prime is 166056647. The next prime is 166056661. The reversal of 166056655 is 556650661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556650661 = 7 ⋅79521523.

It is not a de Polignac number, because 166056655 - 2³ = 166056647 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 16605661 + ... + 16605670.

It is an arithmetic number, because the mean of its divisors is an integer number (49816998).

Almost surely, 2^166056655 is an apocalyptic number.

166056655 is a deficient number, since it is larger than the sum of its proper divisors (33211337).

166056655 is an equidigital number, since it uses as much as digits as its factorization.

166056655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33211336.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 166056655 is about 12886.2971795625. The cubic root of 166056655 is about 549.6489826352.

The spelling of 166056655 in words is "one hundred sixty-six million, fifty-six thousand, six hundred fifty-five".