166813550 has 12 divisors (see below), whose sum is σ = 310273296. Its totient is φ = 66725400.

The previous prime is 166813523. The next prime is 166813583. The reversal of 166813550 is 55318661.

166813550 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 166813550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1668086 + ... + 1668185.

It is an arithmetic number, because the mean of its divisors is an integer number (25856108).

Almost surely, 2^166813550 is an apocalyptic number.

166813550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166813550 is a deficient number, since it is larger than the sum of its proper divisors (143459746).

166813550 is a wasteful number, since it uses less digits than its factorization.

166813550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3336283 (or 3336278 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 166813550 is about 12915.6320015708. The cubic root of 166813550 is about 550.4828267072.

The spelling of 166813550 in words is "one hundred sixty-six million, eight hundred thirteen thousand, five hundred fifty".