166404819 has 8 divisors (see below), whose sum is σ = 253569280. Its totient is φ = 95088456.

The previous prime is 166404811. The next prime is 166404893. The reversal of 166404819 is 918404661.

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

It is not a de Polignac number, because 166404819 - 2³ = 166404811 is a prime.

It is a super-2 number, since 2×166404819² = 55381127572845522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166404811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3961999 + ... + 3962040.

It is an arithmetic number, because the mean of its divisors is an integer number (31696160).

Almost surely, 2^166404819 is an apocalyptic number.

166404819 is a deficient number, since it is larger than the sum of its proper divisors (87164461).

166404819 is an equidigital number, since it uses as much as digits as its factorization.

166404819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924049.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 166404819 is about 12899.7991844835. The cubic root of 166404819 is about 550.0328564394.

The spelling of 166404819 in words is "one hundred sixty-six million, four hundred four thousand, eight hundred nineteen".