165155621060 has 12 divisors (see below), whose sum is σ = 346826804268. Its totient is φ = 66062248416.

The previous prime is 165155621041. The next prime is 165155621087. The reversal of 165155621060 is 60126551561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47923339396 + 117232281664 = 218914^2 + 342392^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4128890507 + ... + 4128890546.

It is an arithmetic number, because the mean of its divisors is an integer number (28902233689).

Almost surely, 2^165155621060 is an apocalyptic number.

165155621060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165155621060 is an abundant number, since it is smaller than the sum of its proper divisors (181671183208).

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

165155621060 is a wasteful number, since it uses less digits than its factorization.

165155621060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8257781062 (or 8257781060 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 165155621060 in words is "one hundred sixty-five billion, one hundred fifty-five million, six hundred twenty-one thousand, sixty".