166555560 has 64 divisors (see below), whose sum is σ = 515796480. Its totient is φ = 42981120.

The previous prime is 166555553. The next prime is 166555573. The reversal of 166555560 is 65555661.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 18667 + ... + 26106.

It is an arithmetic number, because the mean of its divisors is an integer number (8059320).

Almost surely, 2^166555560 is an apocalyptic number.

166555560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166555560 is an abundant number, since it is smaller than the sum of its proper divisors (349240920).

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

166555560 is a wasteful number, since it uses less digits than its factorization.

166555560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44818 (or 44814 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 166555560 is about 12905.6406272606. The cubic root of 166555560 is about 550.1988922548.

The spelling of 166555560 in words is "one hundred sixty-six million, five hundred fifty-five thousand, five hundred sixty".