166564550 has 48 divisors (see below), whose sum is σ = 327729024. Its totient is φ = 62880000.

The previous prime is 166564543. The next prime is 166564553. The reversal of 166564550 is 55465661.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166564553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62240 + ... + 64860.

It is an arithmetic number, because the mean of its divisors is an integer number (6827688).

Almost surely, 2^166564550 is an apocalyptic number.

166564550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166564550 is a deficient number, since it is larger than the sum of its proper divisors (161164474).

166564550 is a wasteful number, since it uses less digits than its factorization.

166564550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2705 (or 2700 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 166564550 is about 12905.9889198775. The cubic root of 166564550 is about 550.2087912520.

The spelling of 166564550 in words is "one hundred sixty-six million, five hundred sixty-four thousand, five hundred fifty".