165666122 has 8 divisors (see below), whose sum is σ = 263116836. Its totient is φ = 77960512.

The previous prime is 165666121. The next prime is 165666133. The reversal of 165666122 is 221666561.

It can be written as a sum of positive squares in 2 ways, for example, as 165662641 + 3481 = 12871^2 + 59^2 .

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

It is not an unprimeable number, because it can be changed into a prime (165666121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2436233 + ... + 2436300.

Almost surely, 2^165666122 is an apocalyptic number.

165666122 is a deficient number, since it is larger than the sum of its proper divisors (97450714).

165666122 is a wasteful number, since it uses less digits than its factorization.

165666122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4872552.

The product of its digits is 25920, while the sum is 35.

The square root of 165666122 is about 12871.1352257678. The cubic root of 165666122 is about 549.2177551870.

The spelling of 165666122 in words is "one hundred sixty-five million, six hundred sixty-six thousand, one hundred twenty-two".