165711668166 has 96 divisors (see below), whose sum is σ = 407873905920. Its totient is φ = 48162744000.

The previous prime is 165711668149. The next prime is 165711668183. The reversal of 165711668166 is 661866117561.

165711668166 is a `hidden beast` number, since 1 + 6 + 571 + 1 + 6 + 6 + 8 + 1 + 66 = 666.

It is an interprime number because it is at equal distance from previous prime (165711668149) and next prime (165711668183).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 771481 + ... + 962603.

It is an arithmetic number, because the mean of its divisors is an integer number (4248686520).

Almost surely, 2^165711668166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165711668166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203936952960).

165711668166 is an abundant number, since it is smaller than the sum of its proper divisors (242162237754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165711668166 is a wasteful number, since it uses less digits than its factorization.

165711668166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191322 (or 191319 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The spelling of 165711668166 in words is "one hundred sixty-five billion, seven hundred eleven million, six hundred sixty-eight thousand, one hundred sixty-six".