665184380 has 96 divisors (see below), whose sum is σ = 1677182976. Its totient is φ = 216665856.

The previous prime is 665184379. The next prime is 665184383. The reversal of 665184380 is 83481566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665184383) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 537122 + ... + 538358.

It is an arithmetic number, because the mean of its divisors is an integer number (17470656).

Almost surely, 2^665184380 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 665184380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (838591488).

665184380 is an abundant number, since it is smaller than the sum of its proper divisors (1011998596).

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

665184380 is a wasteful number, since it uses less digits than its factorization.

665184380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443 (or 1441 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 665184380 is about 25791.1686435493. The cubic root of 665184380 is about 872.9325359531.

The spelling of 665184380 in words is "six hundred sixty-five million, one hundred eighty-four thousand, three hundred eighty".