165440381108 has 12 divisors (see below), whose sum is σ = 306551294532. Its totient is φ = 77854296960.

The previous prime is 165440381107. The next prime is 165440381191. The reversal of 165440381108 is 801183044561.

It can be written as a sum of positive squares in 2 ways, for example, as 88168612624 + 77271768484 = 296932^2 + 277978^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165440381107) 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, 1216473323 + ... + 1216473458.

It is an arithmetic number, because the mean of its divisors is an integer number (25545941211).

Almost surely, 2^165440381108 is an apocalyptic number.

It is an amenable number.

165440381108 is a deficient number, since it is larger than the sum of its proper divisors (141110913424).

165440381108 is a wasteful number, since it uses less digits than its factorization.

165440381108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2432946802 (or 2432946800 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 165440381108 in words is "one hundred sixty-five billion, four hundred forty million, three hundred eighty-one thousand, one hundred eight".