166404503 has 8 divisors (see below), whose sum is σ = 171072048. Its totient is φ = 161745984.

The previous prime is 166404499. The next prime is 166404529. The reversal of 166404503 is 305404661.

It is a happy number.

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 166404503 - 2² = 166404499 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 (166404583) 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, 54875 + ... + 57827.

It is an arithmetic number, because the mean of its divisors is an integer number (21384006).

Almost surely, 2^166404503 is an apocalyptic number.

166404503 is a deficient number, since it is larger than the sum of its proper divisors (4667545).

166404503 is a wasteful number, since it uses less digits than its factorization.

166404503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4513.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 166404503 is about 12899.7869362250. The cubic root of 166404503 is about 550.0325082714.

The spelling of 166404503 in words is "one hundred sixty-six million, four hundred four thousand, five hundred three".