166206405 has 16 divisors (see below), whose sum is σ = 273118464. Its totient is φ = 86247360.

The previous prime is 166206401. The next prime is 166206413. The reversal of 166206405 is 504602661.

166206405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166206405 - 2² = 166206401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166206401) 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, 149181 + ... + 150290.

It is an arithmetic number, because the mean of its divisors is an integer number (17069904).

Almost surely, 2^166206405 is an apocalyptic number.

166206405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166206405 is a deficient number, since it is larger than the sum of its proper divisors (106912059).

166206405 is a wasteful number, since it uses less digits than its factorization.

166206405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299516.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 166206405 is about 12892.1063057981. The cubic root of 166206405 is about 549.8141575975.

The spelling of 166206405 in words is "one hundred sixty-six million, two hundred six thousand, four hundred five".