166545855 has 96 divisors (see below), whose sum is σ = 364927680. Its totient is φ = 71608320.

The previous prime is 166545839. The next prime is 166545877. The reversal of 166545855 is 558545661.

166545855 is a `hidden beast` number, since 1 + 6 + 65 + 4 + 585 + 5 = 666.

It is not a de Polignac number, because 166545855 - 2⁴ = 166545839 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 166545855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 111715 + ... + 113195.

It is an arithmetic number, because the mean of its divisors is an integer number (3801330).

Almost surely, 2^166545855 is an apocalyptic number.

166545855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166545855 is an abundant number, since it is smaller than the sum of its proper divisors (198381825).

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

166545855 is a wasteful number, since it uses less digits than its factorization.

166545855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526 (or 1513 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The square root of 166545855 is about 12905.2646234008. The cubic root of 166545855 is about 550.1882055627.

The spelling of 166545855 in words is "one hundred sixty-six million, five hundred forty-five thousand, eight hundred fifty-five".