166506406 has 24 divisors (see below), whose sum is σ = 280931112. Its totient is φ = 73920000.

The previous prime is 166506397. The next prime is 166506409. The reversal of 166506406 is 604605661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166506409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2406 + ... + 18406.

It is an arithmetic number, because the mean of its divisors is an integer number (11705463).

Almost surely, 2^166506406 is an apocalyptic number.

166506406 is a deficient number, since it is larger than the sum of its proper divisors (114424706).

166506406 is a wasteful number, since it uses less digits than its factorization.

166506406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16068 (or 16057 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 166506406 is about 12903.7361256343. The cubic root of 166506406 is about 550.1447618948.

The spelling of 166506406 in words is "one hundred sixty-six million, five hundred six thousand, four hundred six".