665145124 has 48 divisors (see below), whose sum is σ = 1359566208. Its totient is φ = 278823168.

The previous prime is 665145109. The next prime is 665145133. The reversal of 665145124 is 421541566.

665145124 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 665145124.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775704 + ... + 776560.

It is an arithmetic number, because the mean of its divisors is an integer number (28324296).

Almost surely, 2^665145124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665145124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679783104).

665145124 is an abundant number, since it is smaller than the sum of its proper divisors (694421084).

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

665145124 is a wasteful number, since it uses less digits than its factorization.

665145124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444 (or 1442 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 665145124 is about 25790.4075966240. The cubic root of 665145124 is about 872.9153635145.

The spelling of 665145124 in words is "six hundred sixty-five million, one hundred forty-five thousand, one hundred twenty-four".