165620992 has 18 divisors (see below), whose sum is σ = 330595538. Its totient is φ = 82810368.

The previous prime is 165620989. The next prime is 165621011. The reversal of 165620992 is 299026561.

It can be written as a sum of positive squares in only one way, i.e., 113550336 + 52070656 = 10656^2 + 7216^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323223 + ... + 323734.

Almost surely, 2^165620992 is an apocalyptic number.

It is an amenable number.

165620992 is a deficient number, since it is larger than the sum of its proper divisors (164974546).

165620992 is an frugal number, since it uses more digits than its factorization.

165620992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646973 (or 646959 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 165620992 is about 12869.3819587422. The cubic root of 165620992 is about 549.1678788694.

The spelling of 165620992 in words is "one hundred sixty-five million, six hundred twenty thousand, nine hundred ninety-two".