166555000 has 40 divisors (see below), whose sum is σ = 390250080. Its totient is φ = 66620000.

The previous prime is 166554979. The next prime is 166555009. The reversal of 166555000 is 555661.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 166555000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166555009) 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 9 ways as a sum of consecutive naturals, for example, 11656 + ... + 21655.

It is an arithmetic number, because the mean of its divisors is an integer number (9756252).

Almost surely, 2^166555000 is an apocalyptic number.

166555000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166555000 is an abundant number, since it is smaller than the sum of its proper divisors (223695080).

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

166555000 is an equidigital number, since it uses as much as digits as its factorization.

166555000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33337 (or 33318 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 166555000 is about 12905.6189313028. The cubic root of 166555000 is about 550.1982756203.

It can be divided in two parts, 1665 and 55000, that added together give a palindrome (56665).

The spelling of 166555000 in words is "one hundred sixty-six million, five hundred fifty-five thousand".