665191224 has 64 divisors (see below), whose sum is σ = 1864173600. Its totient is φ = 219760128.

The previous prime is 665191207. The next prime is 665191237. The reversal of 665191224 is 422191566.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 in 15 ways as a sum of consecutive naturals, for example, 10782 + ... + 38034.

Almost surely, 2^665191224 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 665191224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (932086800).

665191224 is an abundant number, since it is smaller than the sum of its proper divisors (1198982376).

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

665191224 is a wasteful number, since it uses less digits than its factorization.

665191224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27381 (or 27371 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 665191224 is about 25791.3013242837. The cubic root of 665191224 is about 872.9355297745.

The spelling of 665191224 in words is "six hundred sixty-five million, one hundred ninety-one thousand, two hundred twenty-four".