166639359 has 4 divisors (see below), whose sum is σ = 222185816. Its totient is φ = 111092904.

The previous prime is 166639351. The next prime is 166639397. The reversal of 166639359 is 953936661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166639359 - 2³ = 166639351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166639351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27773224 + ... + 27773229.

It is an arithmetic number, because the mean of its divisors is an integer number (55546454).

Almost surely, 2^166639359 is an apocalyptic number.

166639359 is a deficient number, since it is larger than the sum of its proper divisors (55546457).

166639359 is an equidigital number, since it uses as much as digits as its factorization.

166639359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55546456.

The product of its digits is 787320, while the sum is 48.

The square root of 166639359 is about 12908.8868226505. The cubic root of 166639359 is about 550.2911505312.

The spelling of 166639359 in words is "one hundred sixty-six million, six hundred thirty-nine thousand, three hundred fifty-nine".