166404455 has 8 divisors (see below), whose sum is σ = 228211872. Its totient is φ = 114105888.

The previous prime is 166404443. The next prime is 166404463. The reversal of 166404455 is 554404661.

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

It is a cyclic number.

It is not a de Polignac number, because 166404455 - 2⁶ = 166404391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 4754413 = 166404455 / (1 + 6 + 6 + 4 + 0 + 4 + 4 + 5 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2377172 + ... + 2377241.

It is an arithmetic number, because the mean of its divisors is an integer number (28526484).

Almost surely, 2^166404455 is an apocalyptic number.

166404455 is a deficient number, since it is larger than the sum of its proper divisors (61807417).

166404455 is an equidigital number, since it uses as much as digits as its factorization.

166404455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4754425.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 166404455 is about 12899.7850757290. The cubic root of 166404455 is about 550.0324553851.

The spelling of 166404455 in words is "one hundred sixty-six million, four hundred four thousand, four hundred fifty-five".