165666562 has 8 divisors (see below), whose sum is σ = 259304256. Its totient is φ = 79231812.

The previous prime is 165666551. The next prime is 165666577. The reversal of 165666562 is 265666561.

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

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, 1800678 + ... + 1800769.

It is an arithmetic number, because the mean of its divisors is an integer number (32413032).

Almost surely, 2^165666562 is an apocalyptic number.

165666562 is a deficient number, since it is larger than the sum of its proper divisors (93637694).

165666562 is a wasteful number, since it uses less digits than its factorization.

165666562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601472.

The product of its digits is 388800, while the sum is 43.

The square root of 165666562 is about 12871.1523182658. The cubic root of 165666562 is about 549.2182414172.

Subtracting 165666562 from its reverse (265666561), we obtain a palindrome (99999999).

The spelling of 165666562 in words is "one hundred sixty-five million, six hundred sixty-six thousand, five hundred sixty-two".