165166661606 has 8 divisors (see below), whose sum is σ = 255741927744. Its totient is φ = 79919352360.

The previous prime is 165166661593. The next prime is 165166661701. The reversal of 165166661606 is 606166661561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×165166661606² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1331989145 + ... + 1331989268.

It is an arithmetic number, because the mean of its divisors is an integer number (31967740968).

Almost surely, 2^165166661606 is an apocalyptic number.

165166661606 is a deficient number, since it is larger than the sum of its proper divisors (90575266138).

165166661606 is a wasteful number, since it uses less digits than its factorization.

165166661606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663978446.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 165166661606 in words is "one hundred sixty-five billion, one hundred sixty-six million, six hundred sixty-one thousand, six hundred six".