166055571 has 12 divisors (see below), whose sum is σ = 261663480. Its totient is φ = 100639680.

The previous prime is 166055569. The next prime is 166055579. The reversal of 166055571 is 175550661.

It is not a de Polignac number, because 166055571 - 2¹ = 166055569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166055579) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 838566 + ... + 838763.

It is an arithmetic number, because the mean of its divisors is an integer number (21805290).

Almost surely, 2^166055571 is an apocalyptic number.

166055571 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166055571 is a deficient number, since it is larger than the sum of its proper divisors (95607909).

166055571 is a wasteful number, since it uses less digits than its factorization.

166055571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677346 (or 1677343 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The square root of 166055571 is about 12886.2551193122. The cubic root of 166055571 is about 549.6477866161.

The spelling of 166055571 in words is "one hundred sixty-six million, fifty-five thousand, five hundred seventy-one".