166958550 has 96 divisors (see below), whose sum is σ = 501932160. Its totient is φ = 40471200.

The previous prime is 166958549. The next prime is 166958579. The reversal of 166958550 is 55859661.

It is a happy number.

166958550 is a `hidden beast` number, since 1 + 6 + 6 + 95 + 8 + 550 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 166958496 and 166958505.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 9229 + ... + 20471.

It is an arithmetic number, because the mean of its divisors is an integer number (5228460).

Almost surely, 2^166958550 is an apocalyptic number.

166958550 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 166958550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250966080).

166958550 is an abundant number, since it is smaller than the sum of its proper divisors (334973610).

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

166958550 is a wasteful number, since it uses less digits than its factorization.

166958550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11275 (or 11264 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 166958550 is about 12921.2441351443. The cubic root of 166958550 is about 550.6422799682.

The spelling of 166958550 in words is "one hundred sixty-six million, nine hundred fifty-eight thousand, five hundred fifty".