165213361664666 has 64 divisors (see below), whose sum is σ = 318791807205120. Its totient is φ = 62508197145600.

The previous prime is 165213361664641. The next prime is 165213361664677. The reversal of 165213361664666 is 666466163312561.

It is a junction number, because it is equal to n+sod(n) for n = 165213361664599 and 165213361664608.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180411905 + ... + 181325348.

It is an arithmetic number, because the mean of its divisors is an integer number (4981121987580).

Almost surely, 2^{165213361664666} is an apocalyptic number.

165213361664666 is a deficient number, since it is larger than the sum of its proper divisors (153578445540454).

165213361664666 is a wasteful number, since it uses less digits than its factorization.

165213361664666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361737399.

The product of its digits is 100776960, while the sum is 62.

The spelling of 165213361664666 in words is "one hundred sixty-five trillion, two hundred thirteen billion, three hundred sixty-one million, six hundred sixty-four thousand, six hundred sixty-six".