166005550 has 24 divisors (see below), whose sum is σ = 309585096. Its totient is φ = 66227040.

The previous prime is 166005529. The next prime is 166005571. The reversal of 166005550 is 55500661.

166005550 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166005529) and next prime (166005571).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15669 + ... + 24031.

It is an arithmetic number, because the mean of its divisors is an integer number (12899379).

Almost surely, 2^166005550 is an apocalyptic number.

166005550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166005550 is a deficient number, since it is larger than the sum of its proper divisors (143579546).

166005550 is a wasteful number, since it uses less digits than its factorization.

166005550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8772 (or 8767 counting only the distinct ones).

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

The square root of 166005550 is about 12884.3141066958. The cubic root of 166005550 is about 549.5925908507.

The spelling of 166005550 in words is "one hundred sixty-six million, five thousand, five hundred fifty".