166199550 has 72 divisors (see below), whose sum is σ = 453101208. Its totient is φ = 40286400.

The previous prime is 166199549. The next prime is 166199581. The reversal of 166199550 is 55991661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13572 + ... + 22728.

Almost surely, 2^166199550 is an apocalyptic number.

166199550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166199550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226550604).

166199550 is an abundant number, since it is smaller than the sum of its proper divisors (286901658).

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

166199550 is a wasteful number, since it uses less digits than its factorization.

166199550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194 (or 9178 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 166199550 is about 12891.8404426986. The cubic root of 166199550 is about 549.8065986672.

The spelling of 166199550 in words is "one hundred sixty-six million, one hundred ninety-nine thousand, five hundred fifty".