166435660205 has 4 divisors (see below), whose sum is σ = 199722792252. Its totient is φ = 133148528160.

The previous prime is 166435660169. The next prime is 166435660217. The reversal of 166435660205 is 502066534661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 118631336041 + 47804324164 = 344429^2 + 218642^2 .

It is not a de Polignac number, because 166435660205 - 2¹² = 166435656109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16643566016 + ... + 16643566025.

It is an arithmetic number, because the mean of its divisors is an integer number (49930698063).

Almost surely, 2^166435660205 is an apocalyptic number.

It is an amenable number.

166435660205 is a deficient number, since it is larger than the sum of its proper divisors (33287132047).

166435660205 is an equidigital number, since it uses as much as digits as its factorization.

166435660205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33287132046.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 166435660205 in words is "one hundred sixty-six billion, four hundred thirty-five million, six hundred sixty thousand, two hundred five".