166905590 has 8 divisors (see below), whose sum is σ = 300430080. Its totient is φ = 66762232.

The previous prime is 166905587. The next prime is 166905611. The reversal of 166905590 is 95509661.

166905590 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 8345270 + ... + 8345289.

It is an arithmetic number, because the mean of its divisors is an integer number (37553760).

Almost surely, 2^166905590 is an apocalyptic number.

166905590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166905590 is a deficient number, since it is larger than the sum of its proper divisors (133524490).

166905590 is a wasteful number, since it uses less digits than its factorization.

166905590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16690566.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 166905590 is about 12919.1946343416. The cubic root of 166905590 is about 550.5840517451.

The spelling of 166905590 in words is "one hundred sixty-six million, nine hundred five thousand, five hundred ninety".