166036405 has 4 divisors (see below), whose sum is σ = 199243692. Its totient is φ = 132829120.

The previous prime is 166036393. The next prime is 166036417. The reversal of 166036405 is 504630661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (166036393) and next prime (166036417).

It can be written as a sum of positive squares in 2 ways, for example, as 23902321 + 142134084 = 4889^2 + 11922^2 .

It is not a de Polignac number, because 166036405 - 2⁹ = 166035893 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16603636 + ... + 16603645.

It is an arithmetic number, because the mean of its divisors is an integer number (49810923).

Almost surely, 2^166036405 is an apocalyptic number.

It is an amenable number.

166036405 is a deficient number, since it is larger than the sum of its proper divisors (33207287).

166036405 is an equidigital number, since it uses as much as digits as its factorization.

166036405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33207286.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 166036405 is about 12885.5114372694. The cubic root of 166036405 is about 549.6266391679.

The spelling of 166036405 in words is "one hundred sixty-six million, thirty-six thousand, four hundred five".