16665404 has 48 divisors (see below), whose sum is σ = 34546176. Its totient is φ = 6888000.

The previous prime is 16665403. The next prime is 16665421. The reversal of 16665404 is 40456661.

16665404 = T₃₀₁ + T₃₀₂ + ... + T₅₀₂.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16665403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164954 + ... + 165054.

It is an arithmetic number, because the mean of its divisors is an integer number (719712).

Almost surely, 2^16665404 is an apocalyptic number.

16665404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16665404 is an abundant number, since it is smaller than the sum of its proper divisors (17880772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16665404 is a wasteful number, since it uses less digits than its factorization.

16665404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 16665404 is about 4082.3282572571. The cubic root of 16665404 is about 255.4300266791.

The spelling of 16665404 in words is "sixteen million, six hundred sixty-five thousand, four hundred four".