665855224 has 8 divisors (see below), whose sum is σ = 1248478560. Its totient is φ = 332927608.

The previous prime is 665855173. The next prime is 665855227. The reversal of 665855224 is 422558566.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665855227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41615944 + ... + 41615959.

It is an arithmetic number, because the mean of its divisors is an integer number (156059820).

Almost surely, 2^665855224 is an apocalyptic number.

It is an amenable number.

665855224 is a deficient number, since it is larger than the sum of its proper divisors (582623336).

665855224 is a wasteful number, since it uses less digits than its factorization.

665855224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83231909 (or 83231905 counting only the distinct ones).

The product of its digits is 576000, while the sum is 43.

The square root of 665855224 is about 25804.1706706493. The cubic root of 665855224 is about 873.2258906081.

The spelling of 665855224 in words is "six hundred sixty-five million, eight hundred fifty-five thousand, two hundred twenty-four".